Hive off the ensemble code into its own file.

Split the [switch] compiler for sanity's sake.

1 files changed, 90 insertions, 2809 deletions

diff --git a/generic/tclNamesp.c b/generic/tclNamesp.c
index f8ee460..fbbab98 100644
--- a/generic/tclNamesp.c
+++ b/generic/tclNamesp.c
@@ -23,7 +23,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclNamesp.c,v 1.199 2010/01/03 20:29:11 msofer Exp $
+ * RCS: @(#) $Id: tclNamesp.c,v 1.200 2010/02/13 18:11:06 dkf Exp $
  */
 
 #include "tclInt.h"
@@ -70,87 +70,6 @@ typedef struct ResolvedNsName {
 } ResolvedNsName;
 
 /*
- * The client data for an ensemble command. This consists of the table of
- * commands that are actually exported by the namespace, and an epoch counter
- * that, combined with the exportLookupEpoch field of the namespace structure,
- * defines whether the table contains valid data or will need to be recomputed
- * next time the ensemble command is called.
- */
-
-typedef struct EnsembleConfig {
-    Namespace *nsPtr;		/* The namspace backing this ensemble up. */
-    Tcl_Command token;		/* The token for the command that provides
-				 * ensemble support for the namespace, or NULL
-				 * if the command has been deleted (or never
-				 * existed; the global namespace never has an
-				 * ensemble command.) */
-    int epoch;			/* The epoch at which this ensemble's table of
-				 * exported commands is valid. */
-    char **subcommandArrayPtr;	/* Array of ensemble subcommand names. At all
-				 * consistent points, this will have the same
-				 * number of entries as there are entries in
-				 * the subcommandTable hash. */
-    Tcl_HashTable subcommandTable;
-				/* Hash table of ensemble subcommand names,
-				 * which are its keys so this also provides
-				 * the storage management for those subcommand
-				 * names. The contents of the entry values are
-				 * object version the prefix lists to use when
-				 * substituting for the command/subcommand to
-				 * build the ensemble implementation command.
-				 * Has to be stored here as well as in
-				 * subcommandDict because that field is NULL
-				 * when we are deriving the ensemble from the
-				 * namespace exports list. FUTURE WORK: use
-				 * object hash table here. */
-    struct EnsembleConfig *next;/* The next ensemble in the linked list of
-				 * ensembles associated with a namespace. If
-				 * this field points to this ensemble, the
-				 * structure has already been unlinked from
-				 * all lists, and cannot be found by scanning
-				 * the list from the namespace's ensemble
-				 * field. */
-    int flags;			/* ORed combo of TCL_ENSEMBLE_PREFIX, ENS_DEAD
-				 * and ENSEMBLE_COMPILE. */
-
-    /* OBJECT FIELDS FOR ENSEMBLE CONFIGURATION */
-
-    Tcl_Obj *subcommandDict;	/* Dictionary providing mapping from
-				 * subcommands to their implementing command
-				 * prefixes, or NULL if we are to build the
-				 * map automatically from the namespace
-				 * exports. */
-    Tcl_Obj *subcmdList;	/* List of commands that this ensemble
-				 * actually provides, and whose implementation
-				 * will be built using the subcommandDict (if
-				 * present and defined) and by simple mapping
-				 * to the namespace otherwise. If NULL,
-				 * indicates that we are using the (dynamic)
-				 * list of currently exported commands. */
-    Tcl_Obj *unknownHandler;	/* Script prefix used to handle the case when
-				 * no match is found (according to the rule
-				 * defined by flag bit TCL_ENSEMBLE_PREFIX) or
-				 * NULL to use the default error-generating
-				 * behaviour. The script execution gets all
-				 * the arguments to the ensemble command
-				 * (including objv[0]) and will have the
-				 * results passed directly back to the caller
-				 * (including the error code) unless the code
-				 * is TCL_CONTINUE in which case the
-				 * subcommand will be reparsed by the ensemble
-				 * core, presumably because the ensemble
-				 * itself has been updated. */
-    Tcl_Obj *parameterList;	/* List of ensemble parameter names. */
-    int numParameters;		/* Cached number of parameters. This is either
-				 * 0 (if the parameterList field is NULL) or
-				 * the length of the list in the parameterList
-				 * field. */
-} EnsembleConfig;
-
-#define ENS_DEAD	0x1	/* Flag value to say that the ensemble is dead
-				 * and on its way out. */
-
-/*
  * Declarations for functions local to this file:
  */
 
@@ -160,9 +79,6 @@ static int		DoImport(Tcl_Interp *interp,
 			    const char *cmdName, const char *pattern,
 			    Namespace *importNsPtr, int allowOverwrite);
 static void		DupNsNameInternalRep(Tcl_Obj *objPtr,Tcl_Obj *copyPtr);
-static inline int	EnsembleUnknownCallback(Tcl_Interp *interp,
-			    EnsembleConfig *ensemblePtr, int objc,
-			    Tcl_Obj *const objv[], Tcl_Obj **prefixObjPtr);
 static char *		ErrorCodeRead(ClientData clientData,Tcl_Interp *interp,
 			    const char *name1, const char *name2, int flags);
 static char *		ErrorInfoRead(ClientData clientData,Tcl_Interp *interp,
@@ -188,8 +104,6 @@ static int		NamespaceCurrentCmd(ClientData dummy,
 			    Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
 static int		NamespaceDeleteCmd(ClientData dummy,Tcl_Interp *interp,
 			    int objc, Tcl_Obj *const objv[]);
-static int		NamespaceEnsembleCmd(ClientData dummy,
-			    Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
 static int		NamespaceEvalCmd(ClientData dummy, Tcl_Interp *interp,
 			    int objc, Tcl_Obj *const objv[]);
 static int		NamespaceExistsCmd(ClientData dummy,Tcl_Interp *interp,
@@ -221,20 +135,6 @@ static int		NamespaceUnknownCmd(ClientData dummy,
 static int		NamespaceWhichCmd(ClientData dummy, Tcl_Interp *interp,
 			    int objc, Tcl_Obj *const objv[]);
 static int		SetNsNameFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
-static int		NsEnsembleImplementationCmd(ClientData clientData,
-			    Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
-static int		NsEnsembleImplementationCmdNR(ClientData clientData,
-			    Tcl_Interp *interp,int objc,Tcl_Obj *const objv[]);
-static void		BuildEnsembleConfig(EnsembleConfig *ensemblePtr);
-static int		NsEnsembleStringOrder(const void *strPtr1,
-			    const void *strPtr2);
-static void		DeleteEnsembleConfig(ClientData clientData);
-static void		MakeCachedEnsembleCommand(Tcl_Obj *objPtr,
-			    EnsembleConfig *ensemblePtr,
-			    const char *subcmdName, Tcl_Obj *prefixObjPtr);
-static void		FreeEnsembleCmdRep(Tcl_Obj *objPtr);
-static void		DupEnsembleCmdRep(Tcl_Obj *objPtr, Tcl_Obj *copyPtr);
-static void		StringOfEnsembleCmdRep(Tcl_Obj *objPtr);
 static void		UnlinkNsPath(Namespace *nsPtr);
 
 static Tcl_NRPostProc NsEval_Callback;
@@ -253,21 +153,6 @@ static const Tcl_ObjType nsNameType = {
     NULL,			/* updateStringProc */
     SetNsNameFromAny		/* setFromAnyProc */
 };
-
-/*
- * This structure defines a Tcl object type that contains a reference to an
- * ensemble subcommand (e.g. the "length" in [string length ab]). It is used
- * to cache the mapping between the subcommand itself and the real command
- * that implements it.
- */
-
-const Tcl_ObjType tclEnsembleCmdType = {
-    "ensembleCommand",		/* the type's name */
-    FreeEnsembleCmdRep,		/* freeIntRepProc */
-    DupEnsembleCmdRep,		/* dupIntRepProc */
-    StringOfEnsembleCmdRep,	/* updateStringProc */
-    NULL			/* setFromAnyProc */
-};
 
 /*
  *----------------------------------------------------------------------
@@ -430,7 +315,7 @@ Tcl_PushCallFrame(
     framePtr->clientData = NULL;
     framePtr->localCachePtr = NULL;
     framePtr->tailcallPtr = NULL;
-    
+
     /*
      * Push the new call frame onto the interpreter's stack of procedure call
      * frames making it the current frame.
@@ -556,7 +441,7 @@ void
 TclPopStackFrame(
     Tcl_Interp *interp)		/* Interpreter with call frame to pop. */
 {
-    CallFrame *freePtr = ((Interp *)interp)->framePtr;
+    CallFrame *freePtr = ((Interp *) interp)->framePtr;
 
     Tcl_PopCallFrame(interp);
     TclStackFree(interp, freePtr);
@@ -619,7 +504,7 @@ ErrorCodeRead(
     const char *name2,
     int flags)
 {
-    Interp *iPtr = (Interp *)interp;
+    Interp *iPtr = (Interp *) interp;
 
     if (Tcl_InterpDeleted(interp) || !(iPtr->flags & ERR_LEGACY_COPY)) {
 	return NULL;
@@ -852,7 +737,7 @@ Tcl_CreateNamespace(
 
     if (parentPtr != NULL) {
 	entryPtr = Tcl_CreateHashEntry(
-		TclGetNamespaceChildTable((Tcl_Namespace *)parentPtr),
+		TclGetNamespaceChildTable((Tcl_Namespace *) parentPtr),
 		simpleName, &newEntry);
 	Tcl_SetHashValue(entryPtr, nsPtr);
     } else {
@@ -973,14 +858,14 @@ Tcl_DeleteNamespace(
 	    entryPtr != NULL;) {
 	cmdPtr = (Command *) Tcl_GetHashValue(entryPtr);
 	if (cmdPtr->nreProc == NRInterpCoroutine) {
-	    Tcl_DeleteCommandFromToken((Tcl_Interp *) iPtr, (Tcl_Command)cmdPtr);
-	    entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);	    
+	    Tcl_DeleteCommandFromToken((Tcl_Interp *) iPtr,
+		    (Tcl_Command) cmdPtr);
+	    entryPtr = Tcl_FirstHashEntry(&nsPtr->cmdTable, &search);
 	} else {
 	    entryPtr = entryPtr->nextPtr;
 	}
-    }    
-    
-    
+    }
+
     /*
      * If the namespace has associated ensemble commands, delete them first.
      * This leaves the actual contents of the namespace alone (unless they are
@@ -1183,6 +1068,7 @@ TclTeardownNamespace(
     }
     if (nsPtr->commandPathSourceList != NULL) {
 	NamespacePathEntry *nsPathPtr = nsPtr->commandPathSourceList;
+
 	do {
 	    if (nsPathPtr->nsPtr != NULL && nsPathPtr->creatorNsPtr != NULL) {
 		nsPathPtr->creatorNsPtr->cmdRefEpoch++;
@@ -1290,6 +1176,33 @@ NamespaceFree(
 /*
  *----------------------------------------------------------------------
  *
+ * TclNsDecrRefCount --
+ *
+ *	Drops a reference to a namespace and frees it if the namespace has
+ *	been deleted and the last reference has just been dropped.
+ *
+ * Results:
+ *	None.
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TclNsDecrRefCount(
+    Namespace *nsPtr)
+{
+    nsPtr->refCount--;
+    if ((nsPtr->refCount == 0) && (nsPtr->flags & NS_DEAD)) {
+	NamespaceFree(nsPtr);
+    }
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * Tcl_Export --
  *
  *	Makes all the commands matching a pattern available to later be
@@ -1616,6 +1529,7 @@ Tcl_Import(
     for (hPtr = Tcl_FirstHashEntry(&importNsPtr->cmdTable, &search);
 	    (hPtr != NULL); hPtr = Tcl_NextHashEntry(&search)) {
 	char *cmdName = Tcl_GetHashKey(&importNsPtr->cmdTable, hPtr);
+
 	if (Tcl_StringMatch(cmdName, simplePattern) &&
 		DoImport(interp, nsPtr, hPtr, cmdName, pattern, importNsPtr,
 		allowOverwrite) == TCL_ERROR) {
@@ -1834,13 +1748,13 @@ Tcl_ForgetImport(
 	 */
 
 	if (TclMatchIsTrivial(simplePattern)) {
-	    Command *cmdPtr;
-
 	    hPtr = Tcl_FindHashEntry(&nsPtr->cmdTable, simplePattern);
-	    if ((hPtr != NULL)
-		    && (cmdPtr = Tcl_GetHashValue(hPtr))
-		    && (cmdPtr->deleteProc == DeleteImportedCmd)) {
-		Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
+	    if (hPtr != NULL) {
+		Command *cmdPtr = Tcl_GetHashValue(hPtr);
+
+		if (cmdPtr && (cmdPtr->deleteProc == DeleteImportedCmd)) {
+		    Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
+		}
 	    }
 	    return TCL_OK;
 	}
@@ -1970,7 +1884,7 @@ InvokeImportedNRCmd(
     ImportedCmdData *dataPtr = clientData;
     Command *realCmdPtr = dataPtr->realCmdPtr;
 
-    ((Interp *)interp)->evalFlags |= TCL_EVAL_REDIRECT;
+    ((Interp *) interp)->evalFlags |= TCL_EVAL_REDIRECT;
     return Tcl_NRCmdSwap(interp, (Tcl_Command) realCmdPtr, objc, objv, 0);
 }
 
@@ -2424,7 +2338,9 @@ Tcl_FindNamespace(
 
     if (nsPtr != NULL) {
 	return (Tcl_Namespace *) nsPtr;
-    } else if (flags & TCL_LEAVE_ERR_MSG) {
+    }
+
+    if (flags & TCL_LEAVE_ERR_MSG) {
 	Tcl_ResetResult(interp);
 	Tcl_AppendResult(interp, "unknown namespace \"", name, "\"", NULL);
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", name, NULL);
@@ -2739,7 +2655,7 @@ TclResetShadowedCmdRefs(
 		 * for a fresh compilation of every bytecode.
 		 */
 
-		if (((Command *)Tcl_GetHashValue(hPtr))->compileProc != NULL) {
+		if (((Command *)Tcl_GetHashValue(hPtr))->compileProc != NULL){
 		    nsPtr->resolverEpoch++;
 		}
 	    }
@@ -2753,6 +2669,7 @@ TclResetShadowedCmdRefs(
 	trailFront++;
 	if (trailFront == trailSize) {
 	    int newSize = 2 * trailSize;
+
 	    trailPtr = (Namespace **) TclStackRealloc(interp,
 		    trailPtr, newSize * sizeof(Namespace *));
 	    trailSize = newSize;
@@ -2917,7 +2834,7 @@ TclNRNamespaceObjCmd(
 	NSInscopeIdx, NSOriginIdx, NSParentIdx, NSPathIdx, NSQualifiersIdx,
 	NSTailIdx, NSUnknownIdx, NSUpvarIdx, NSWhichIdx
     };
-    int index, result;
+    int index;
 
     if (objc < 2) {
 	Tcl_WrongNumArgs(interp, 1, objv, "subcommand ?arg ...?");
@@ -2928,72 +2845,54 @@ TclNRNamespaceObjCmd(
      * Return an index reflecting the particular subcommand.
      */
 
-    result = Tcl_GetIndexFromObj((Tcl_Interp *) interp, objv[1], subCmds,
-	    "option", /*flags*/ 0, (int *) &index);
-    if (result != TCL_OK) {
-	return result;
+    if (Tcl_GetIndexFromObj(interp, objv[1], subCmds, "option", /*flags*/ 0,
+	    (int *) &index) != TCL_OK) {
+	return TCL_ERROR;
     }
 
     switch (index) {
     case NSChildrenIdx:
-	result = NamespaceChildrenCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceChildrenCmd(clientData, interp, objc, objv);
     case NSCodeIdx:
-	result = NamespaceCodeCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceCodeCmd(clientData, interp, objc, objv);
     case NSCurrentIdx:
-	result = NamespaceCurrentCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceCurrentCmd(clientData, interp, objc, objv);
     case NSDeleteIdx:
-	result = NamespaceDeleteCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceDeleteCmd(clientData, interp, objc, objv);
     case NSEnsembleIdx:
-	result = NamespaceEnsembleCmd(clientData, interp, objc, objv);
-	break;
+	return TclNamespaceEnsembleCmd(clientData, interp, objc, objv);
     case NSEvalIdx:
-	result = NamespaceEvalCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceEvalCmd(clientData, interp, objc, objv);
     case NSExistsIdx:
-	result = NamespaceExistsCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceExistsCmd(clientData, interp, objc, objv);
     case NSExportIdx:
-	result = NamespaceExportCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceExportCmd(clientData, interp, objc, objv);
     case NSForgetIdx:
-	result = NamespaceForgetCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceForgetCmd(clientData, interp, objc, objv);
     case NSImportIdx:
-	result = NamespaceImportCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceImportCmd(clientData, interp, objc, objv);
     case NSInscopeIdx:
-	result = NamespaceInscopeCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceInscopeCmd(clientData, interp, objc, objv);
     case NSOriginIdx:
-	result = NamespaceOriginCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceOriginCmd(clientData, interp, objc, objv);
     case NSParentIdx:
-	result = NamespaceParentCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceParentCmd(clientData, interp, objc, objv);
     case NSPathIdx:
-	result = NamespacePathCmd(clientData, interp, objc, objv);
-	break;
+	return NamespacePathCmd(clientData, interp, objc, objv);
     case NSQualifiersIdx:
-	result = NamespaceQualifiersCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceQualifiersCmd(clientData, interp, objc, objv);
     case NSTailIdx:
-	result = NamespaceTailCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceTailCmd(clientData, interp, objc, objv);
     case NSUpvarIdx:
-	result = NamespaceUpvarCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceUpvarCmd(clientData, interp, objc, objv);
     case NSUnknownIdx:
-	result = NamespaceUnknownCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceUnknownCmd(clientData, interp, objc, objv);
     case NSWhichIdx:
-	result = NamespaceWhichCmd(clientData, interp, objc, objv);
-	break;
+	return NamespaceWhichCmd(clientData, interp, objc, objv);
+    default:
+	Tcl_Panic("unhandled namespace subcommand");
     }
-    return result;
+    return TCL_ERROR;
 }
 
 /*
@@ -3320,7 +3219,7 @@ NamespaceDeleteCmd(
 	name = TclGetString(objv[i]);
 	namespacePtr = Tcl_FindNamespace(interp, name, NULL, /*flags*/ 0);
 	if ((namespacePtr == NULL)
-		|| (((Namespace *)namespacePtr)->flags & NS_KILLED)) {
+		|| (((Namespace *) namespacePtr)->flags & NS_KILLED)) {
 	    Tcl_AppendResult(interp, "unknown namespace \"",
 		    TclGetString(objv[i]),
 		    "\" in namespace delete command", NULL);
@@ -3379,7 +3278,7 @@ NamespaceEvalCmd(
     Tcl_Obj *const objv[])	/* Argument objects. */
 {
     Interp *iPtr = (Interp *) interp;
-    CmdFrame* invoker;
+    CmdFrame *invoker;
     int word;
     Tcl_Namespace *namespacePtr;
     CallFrame *framePtr, **framePtrPtr;
@@ -3607,6 +3506,7 @@ NamespaceExportCmd(
 	     */
 
 	    Tcl_Obj *listPtr = Tcl_NewListObj(0, NULL);
+
 	    result = Tcl_AppendExportList(interp, (Tcl_Namespace *) currNsPtr,
 		    listPtr);
 	    if (result != TCL_OK) {
@@ -4202,6 +4102,7 @@ UnlinkNsPath(
     int i;
     for (i=0 ; i<nsPtr->commandPathLength ; i++) {
 	NamespacePathEntry *nsPathPtr = &nsPtr->commandPathArray[i];
+
 	if (nsPathPtr->prevPtr != NULL) {
 	    nsPathPtr->prevPtr->nextPtr = nsPathPtr->nextPtr;
 	}
@@ -4242,6 +4143,7 @@ TclInvalidateNsPath(
     Namespace *nsPtr)
 {
     NamespacePathEntry *nsPathPtr = nsPtr->commandPathSourceList;
+
     while (nsPathPtr != NULL) {
 	if (nsPathPtr->nsPtr != NULL) {
 	    nsPathPtr->creatorNsPtr->cmdRefEpoch++;
@@ -4405,10 +4307,10 @@ Tcl_GetNamespaceUnknownHandler(
 				 * exists. */
     Tcl_Namespace *nsPtr)	/* The namespace. */
 {
-    Namespace *currNsPtr = (Namespace *)nsPtr;
+    Namespace *currNsPtr = (Namespace *) nsPtr;
 
     if (currNsPtr->unknownHandlerPtr == NULL &&
-	    currNsPtr == ((Interp *)interp)->globalNsPtr) {
+	    currNsPtr == ((Interp *) interp)->globalNsPtr) {
 	/*
 	 * Default handler for global namespace is "::unknown". For all other
 	 * namespaces, it is NULL (which falls back on the global unknown
@@ -4449,7 +4351,7 @@ Tcl_SetNamespaceUnknownHandler(
     Tcl_Obj *handlerPtr)	/* The new handler, or NULL to reset. */
 {
     int lstlen = 0;
-    Namespace *currNsPtr = (Namespace *)nsPtr;
+    Namespace *currNsPtr = (Namespace *) nsPtr;
 
     /*
      * Ensure that we check for errors *first* before we change anything.
@@ -4601,8 +4503,7 @@ NamespaceUpvarCmd(
     const char *myName;
 
     if (objc < 3 || !(objc & 1)) {
-	Tcl_WrongNumArgs(interp, 2, objv,
-		"ns ?otherVar myVar ...?");
+	Tcl_WrongNumArgs(interp, 2, objv, "ns ?otherVar myVar ...?");
 	return TCL_ERROR;
     }
 
@@ -4615,7 +4516,7 @@ NamespaceUpvarCmd(
 
     for (; objc>0 ; objc-=2, objv+=2) {
 	/*
-	 * Locate the other variable
+	 * Locate the other variable.
 	 */
 
 	savedNsPtr = (Tcl_Namespace *) iPtr->varFramePtr->nsPtr;
@@ -4744,9 +4645,7 @@ FreeNsNameInternalRep(
     register Tcl_Obj *objPtr)	/* nsName object with internal representation
 				 * to free. */
 {
-    register ResolvedNsName *resNamePtr = (ResolvedNsName *)
-	    objPtr->internalRep.twoPtrValue.ptr1;
-    Namespace *nsPtr;
+    ResolvedNsName *resNamePtr = objPtr->internalRep.twoPtrValue.ptr1;
 
     /*
      * Decrement the reference count of the namespace. If there are no more
@@ -4755,18 +4654,13 @@ FreeNsNameInternalRep(
 
     resNamePtr->refCount--;
     if (resNamePtr->refCount == 0) {
-
 	/*
 	 * Decrement the reference count for the cached namespace. If the
 	 * namespace is dead, and there are no more references to it, free
 	 * it.
 	 */
 
-	nsPtr = resNamePtr->nsPtr;
-	nsPtr->refCount--;
-	if ((nsPtr->refCount == 0) && (nsPtr->flags & NS_DEAD)) {
-	    NamespaceFree(nsPtr);
-	}
+	TclNsDecrRefCount(resNamePtr->nsPtr);
 	ckfree((char *) resNamePtr);
     }
     objPtr->typePtr = NULL;
@@ -4796,8 +4690,7 @@ DupNsNameInternalRep(
     Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
     register Tcl_Obj *copyPtr)	/* Object with internal rep to set. */
 {
-    register ResolvedNsName *resNamePtr = (ResolvedNsName *)
-	    srcPtr->internalRep.twoPtrValue.ptr1;
+    ResolvedNsName *resNamePtr = srcPtr->internalRep.twoPtrValue.ptr1;
 
     copyPtr->internalRep.twoPtrValue.ptr1 = resNamePtr;
     resNamePtr->refCount++;
@@ -4933,2618 +4826,6 @@ TclGetNamespaceChildTable(
 /*
  *----------------------------------------------------------------------
  *
- * NamespaceEnsembleCmd --
- *
- *	Invoked to implement the "namespace ensemble" command that creates and
- *	manipulates ensembles built on top of namespaces. Handles the
- *	following syntax:
- *
- *	    namespace ensemble name ?dictionary?
- *
- * Results:
- *	Returns TCL_OK if successful, and TCL_ERROR if anything goes wrong.
- *
- * Side effects:
- *	Creates the ensemble for the namespace if one did not previously
- *	exist. Alternatively, alters the way that the ensemble's subcommand =>
- *	implementation prefix is configured.
- *
- *----------------------------------------------------------------------
- */
-
-static int
-NamespaceEnsembleCmd(
-    ClientData dummy,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *const objv[])
-{
-    Namespace *nsPtr;
-    Tcl_Command token;
-    static const char *const subcommands[] = {
-	"configure", "create", "exists", NULL
-    };
-    enum EnsSubcmds {
-	ENS_CONFIG, ENS_CREATE, ENS_EXISTS
-    };
-    static const char *const createOptions[] = {
-	"-command", "-map", "-parameters", "-prefixes", "-subcommands",
-	"-unknown", NULL
-    };
-    enum EnsCreateOpts {
-	CRT_CMD, CRT_MAP, CRT_PARAM, CRT_PREFIX, CRT_SUBCMDS, CRT_UNKNOWN
-    };
-    static const char *const configOptions[] = {
-	"-map", "-namespace", "-parameters", "-prefixes", "-subcommands",
-	"-unknown", NULL
-    };
-    enum EnsConfigOpts {
-	CONF_MAP, CONF_NAMESPACE, CONF_PARAM, CONF_PREFIX, CONF_SUBCMDS,
-	CONF_UNKNOWN
-    };
-    int index;
-
-    nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
-    if (nsPtr == NULL || nsPtr->flags & NS_DYING) {
-	if (!Tcl_InterpDeleted(interp)) {
-	    Tcl_AppendResult(interp,
-		    "tried to manipulate ensemble of deleted namespace", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    if (objc < 3) {
-	Tcl_WrongNumArgs(interp, 2, objv, "subcommand ?arg ...?");
-	return TCL_ERROR;
-    }
-    if (Tcl_GetIndexFromObj(interp, objv[2], subcommands, "subcommand", 0,
-	    &index) != TCL_OK) {
-	return TCL_ERROR;
-    }
-
-    switch ((enum EnsSubcmds) index) {
-    case ENS_CREATE: {
-	const char *name;
-	Tcl_DictSearch search;
-	Tcl_Obj *listObj;
-	int done, len, allocatedMapFlag = 0;
-	/*
-	 * Defaults
-	 */
-	Tcl_Obj *subcmdObj = NULL;
-	Tcl_Obj *mapObj = NULL;
-	int permitPrefix = 1;
-	Tcl_Obj *unknownObj = NULL;
-	Tcl_Obj *paramObj = NULL;
-
-	/*
-	 * Check that we've got option-value pairs... [Bug 1558654]
-	 */
-
-	if ((objc & 1) == 0) {
-	    Tcl_WrongNumArgs(interp, 3, objv, "?option value ...?");
-	    return TCL_ERROR;
-	}
-	objv += 3;
-	objc -= 3;
-
-	/*
-	 * Work out what name to use for the command to create. If supplied,
-	 * it is either fully specified or relative to the current namespace.
-	 * If not supplied, it is exactly the name of the current namespace.
-	 */
-
-	name = nsPtr->fullName;
-
-	/*
-	 * Parse the option list, applying type checks as we go. Note that we
-	 * are not incrementing any reference counts in the objects at this
-	 * stage, so the presence of an option multiple times won't cause any
-	 * memory leaks.
-	 */
-
-	for (; objc>1 ; objc-=2,objv+=2) {
-	    if (Tcl_GetIndexFromObj(interp, objv[0], createOptions, "option",
-		    0, &index) != TCL_OK) {
-		if (allocatedMapFlag) {
-		    Tcl_DecrRefCount(mapObj);
-		}
-		return TCL_ERROR;
-	    }
-	    switch ((enum EnsCreateOpts) index) {
-	    case CRT_CMD:
-		name = TclGetString(objv[1]);
-		continue;
-	    case CRT_SUBCMDS:
-		if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		subcmdObj = (len > 0 ? objv[1] : NULL);
-		continue;
-	    case CRT_PARAM:
-		if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		paramObj = (len > 0 ? objv[1] : NULL);
-		continue;
-	    case CRT_MAP: {
-		Tcl_Obj *patchedDict = NULL, *subcmdObj;
-
-		/*
-		 * Verify that the map is sensible.
-		 */
-
-		if (Tcl_DictObjFirst(interp, objv[1], &search,
-			&subcmdObj, &listObj, &done) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		if (done) {
-		    mapObj = NULL;
-		    continue;
-		}
-		do {
-		    Tcl_Obj **listv;
-		    const char *cmd;
-
-		    if (TclListObjGetElements(interp, listObj, &len,
-			    &listv) != TCL_OK) {
-			Tcl_DictObjDone(&search);
-			if (patchedDict) {
-			    Tcl_DecrRefCount(patchedDict);
-			}
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    if (len < 1) {
-			Tcl_SetResult(interp,
-				"ensemble subcommand implementations "
-				"must be non-empty lists", TCL_STATIC);
-			Tcl_DictObjDone(&search);
-			if (patchedDict) {
-			    Tcl_DecrRefCount(patchedDict);
-			}
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    cmd = TclGetString(listv[0]);
-		    if (!(cmd[0] == ':' && cmd[1] == ':')) {
-			Tcl_Obj *newList = Tcl_NewListObj(len, listv);
-			Tcl_Obj *newCmd = Tcl_NewStringObj(nsPtr->fullName,-1);
-
-			if (nsPtr->parentPtr) {
-			    Tcl_AppendStringsToObj(newCmd, "::", NULL);
-			}
-			Tcl_AppendObjToObj(newCmd, listv[0]);
-			Tcl_ListObjReplace(NULL, newList, 0, 1, 1, &newCmd);
-			if (patchedDict == NULL) {
-			    patchedDict = Tcl_DuplicateObj(objv[1]);
-			}
-			Tcl_DictObjPut(NULL, patchedDict, subcmdObj, newList);
-		    }
-		    Tcl_DictObjNext(&search, &subcmdObj, &listObj, &done);
-		} while (!done);
-
-		if (allocatedMapFlag) {
-		    Tcl_DecrRefCount(mapObj);
-		}
-		mapObj = (patchedDict ? patchedDict : objv[1]);
-		if (patchedDict) {
-		    allocatedMapFlag = 1;
-		}
-		continue;
-	    }
-	    case CRT_PREFIX:
-		if (Tcl_GetBooleanFromObj(interp, objv[1],
-			&permitPrefix) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		continue;
-	    case CRT_UNKNOWN:
-		if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		unknownObj = (len > 0 ? objv[1] : NULL);
-		continue;
-	    }
-	}
-
-	/*
-	 * Create the ensemble. Note that this might delete another ensemble
-	 * linked to the same namespace, so we must be careful. However, we
-	 * should be OK because we only link the namespace into the list once
-	 * we've created it (and after any deletions have occurred.)
-	 */
-
-	token = Tcl_CreateEnsemble(interp, name, NULL,
-		(permitPrefix ? TCL_ENSEMBLE_PREFIX : 0));
-	Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
-	Tcl_SetEnsembleMappingDict(interp, token, mapObj);
-	Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
-	Tcl_SetEnsembleParameterList(interp, token, paramObj);
-
-	/*
-	 * Tricky! Must ensure that the result is not shared (command delete
-	 * traces could have corrupted the pristine object that we started
-	 * with). [Snit test rename-1.5]
-	 */
-
-	Tcl_ResetResult(interp);
-	Tcl_GetCommandFullName(interp, token, Tcl_GetObjResult(interp));
-	return TCL_OK;
-    }
-
-    case ENS_EXISTS:
-	if (objc != 4) {
-	    Tcl_WrongNumArgs(interp, 3, objv, "cmdname");
-	    return TCL_ERROR;
-	}
-	Tcl_SetObjResult(interp, Tcl_NewBooleanObj(
-		Tcl_FindEnsemble(interp, objv[3], 0) != NULL));
-	return TCL_OK;
-
-    case ENS_CONFIG:
-	if (objc < 4 || (objc != 5 && objc & 1)) {
-	    Tcl_WrongNumArgs(interp, 3, objv,
-		    "cmdname ?-option value ...? ?arg ...?");
-	    return TCL_ERROR;
-	}
-	token = Tcl_FindEnsemble(interp, objv[3], TCL_LEAVE_ERR_MSG);
-	if (token == NULL) {
-	    return TCL_ERROR;
-	}
-
-	if (objc == 5) {
-	    Tcl_Obj *resultObj = NULL;		/* silence gcc 4 warning */
-
-	    if (Tcl_GetIndexFromObj(interp, objv[4], configOptions, "option",
-		    0, &index) != TCL_OK) {
-		return TCL_ERROR;
-	    }
-	    switch ((enum EnsConfigOpts) index) {
-	    case CONF_SUBCMDS:
-		Tcl_GetEnsembleSubcommandList(NULL, token, &resultObj);
-		if (resultObj != NULL) {
-		    Tcl_SetObjResult(interp, resultObj);
-		}
-		break;
-	    case CONF_PARAM:
-		Tcl_GetEnsembleParameterList(NULL, token, &resultObj);
-		if (resultObj != NULL) {
-		    Tcl_SetObjResult(interp, resultObj);
-		}
-		break;
-	    case CONF_MAP:
-		Tcl_GetEnsembleMappingDict(NULL, token, &resultObj);
-		if (resultObj != NULL) {
-		    Tcl_SetObjResult(interp, resultObj);
-		}
-		break;
-	    case CONF_NAMESPACE: {
-		Tcl_Namespace *namespacePtr = NULL; /* silence gcc 4 warning */
-
-		Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
-		Tcl_SetResult(interp, ((Namespace *)namespacePtr)->fullName,
-			TCL_VOLATILE);
-		break;
-	    }
-	    case CONF_PREFIX: {
-		int flags = 0;			/* silence gcc 4 warning */
-
-		Tcl_GetEnsembleFlags(NULL, token, &flags);
-		Tcl_SetObjResult(interp,
-			Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
-		break;
-	    }
-	    case CONF_UNKNOWN:
-		Tcl_GetEnsembleUnknownHandler(NULL, token, &resultObj);
-		if (resultObj != NULL) {
-		    Tcl_SetObjResult(interp, resultObj);
-		}
-		break;
-	    }
-	    return TCL_OK;
-
-	} else if (objc == 4) {
-	    /*
-	     * Produce list of all information.
-	     */
-
-	    Tcl_Obj *resultObj, *tmpObj = NULL;	/* silence gcc 4 warning */
-	    Tcl_Namespace *namespacePtr = NULL;	/* silence gcc 4 warning */
-	    int flags = 0;			/* silence gcc 4 warning */
-
-	    TclNewObj(resultObj);
-
-	    /* -map option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_MAP], -1));
-	    Tcl_GetEnsembleMappingDict(NULL, token, &tmpObj);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    (tmpObj != NULL) ? tmpObj : Tcl_NewObj());
-
-	    /* -namespace option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_NAMESPACE], -1));
-	    Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(((Namespace *)namespacePtr)->fullName,
-		    -1));
-
-	    /* -parameters option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_PARAM], -1));
-	    Tcl_GetEnsembleParameterList(NULL, token, &tmpObj);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    (tmpObj != NULL) ? tmpObj : Tcl_NewObj());
-
-	    /* -prefix option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_PREFIX], -1));
-	    Tcl_GetEnsembleFlags(NULL, token, &flags);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewBooleanObj(flags & TCL_ENSEMBLE_PREFIX));
-
-	    /* -subcommands option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_SUBCMDS], -1));
-	    Tcl_GetEnsembleSubcommandList(NULL, token, &tmpObj);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    (tmpObj != NULL) ? tmpObj : Tcl_NewObj());
-
-	    /* -unknown option */
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(configOptions[CONF_UNKNOWN], -1));
-	    Tcl_GetEnsembleUnknownHandler(NULL, token, &tmpObj);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    (tmpObj != NULL) ? tmpObj : Tcl_NewObj());
-
-	    Tcl_SetObjResult(interp, resultObj);
-	    return TCL_OK;
-	} else {
-	    Tcl_DictSearch search;
-	    Tcl_Obj *listObj;
-	    int done, len, allocatedMapFlag = 0;
-	    Tcl_Obj *subcmdObj = NULL, *mapObj = NULL, *paramObj = NULL,
-		    *unknownObj = NULL; /* Defaults, silence gcc 4 warnings */
-	    int permitPrefix, flags = 0;	/* silence gcc 4 warning */
-
-	    Tcl_GetEnsembleSubcommandList(NULL, token, &subcmdObj);
-	    Tcl_GetEnsembleMappingDict(NULL, token, &mapObj);
-	    Tcl_GetEnsembleParameterList(NULL, token, &paramObj);
-	    Tcl_GetEnsembleUnknownHandler(NULL, token, &unknownObj);
-	    Tcl_GetEnsembleFlags(NULL, token, &flags);
-	    permitPrefix = (flags & TCL_ENSEMBLE_PREFIX) != 0;
-
-	    objv += 4;
-	    objc -= 4;
-
-	    /*
-	     * Parse the option list, applying type checks as we go. Note that
-	     * we are not incrementing any reference counts in the objects at
-	     * this stage, so the presence of an option multiple times won't
-	     * cause any memory leaks.
-	     */
-
-	    for (; objc>0 ; objc-=2,objv+=2) {
-		if (Tcl_GetIndexFromObj(interp, objv[0], configOptions,
-			"option", 0, &index) != TCL_OK) {
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    return TCL_ERROR;
-		}
-		switch ((enum EnsConfigOpts) index) {
-		case CONF_SUBCMDS:
-		    if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    subcmdObj = (len > 0 ? objv[1] : NULL);
-		    continue;
-		case CONF_PARAM:
-		    if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    paramObj = (len > 0 ? objv[1] : NULL);
-		    continue;
-		case CONF_MAP: {
-		    Tcl_Obj *patchedDict = NULL, *subcmdObj;
-
-		    /*
-		     * Verify that the map is sensible.
-		     */
-
-		    if (Tcl_DictObjFirst(interp, objv[1], &search,
-			    &subcmdObj, &listObj, &done) != TCL_OK) {
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    if (done) {
-			mapObj = NULL;
-			continue;
-		    }
-		    do {
-			Tcl_Obj **listv;
-			const char *cmd;
-
-			if (TclListObjGetElements(interp, listObj, &len,
-				&listv) != TCL_OK) {
-			    Tcl_DictObjDone(&search);
-			    if (patchedDict) {
-				Tcl_DecrRefCount(patchedDict);
-			    }
-			    if (allocatedMapFlag) {
-				Tcl_DecrRefCount(mapObj);
-			    }
-			    return TCL_ERROR;
-			}
-			if (len < 1) {
-			    Tcl_SetResult(interp,
-				    "ensemble subcommand implementations "
-				    "must be non-empty lists", TCL_STATIC);
-			    Tcl_DictObjDone(&search);
-			    if (patchedDict) {
-				Tcl_DecrRefCount(patchedDict);
-			    }
-			    if (allocatedMapFlag) {
-				Tcl_DecrRefCount(mapObj);
-			    }
-			    return TCL_ERROR;
-			}
-			cmd = TclGetString(listv[0]);
-			if (!(cmd[0] == ':' && cmd[1] == ':')) {
-			    Tcl_Obj *newList = Tcl_NewListObj(len, listv);
-			    Tcl_Obj *newCmd =
-				    Tcl_NewStringObj(nsPtr->fullName, -1);
-			    if (nsPtr->parentPtr) {
-				Tcl_AppendStringsToObj(newCmd, "::", NULL);
-			    }
-			    Tcl_AppendObjToObj(newCmd, listv[0]);
-			    Tcl_ListObjReplace(NULL, newList, 0,1, 1,&newCmd);
-			    if (patchedDict == NULL) {
-				patchedDict = Tcl_DuplicateObj(objv[1]);
-			    }
-			    Tcl_DictObjPut(NULL, patchedDict, subcmdObj,
-				    newList);
-			}
-			Tcl_DictObjNext(&search, &subcmdObj, &listObj, &done);
-		    } while (!done);
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    mapObj = (patchedDict ? patchedDict : objv[1]);
-		    if (patchedDict) {
-			allocatedMapFlag = 1;
-		    }
-		    continue;
-		}
-		case CONF_NAMESPACE:
-		    if (allocatedMapFlag) {
-			Tcl_DecrRefCount(mapObj);
-		    }
-		    Tcl_AppendResult(interp, "option -namespace is read-only",
-			    NULL);
-		    return TCL_ERROR;
-		case CONF_PREFIX:
-		    if (Tcl_GetBooleanFromObj(interp, objv[1],
-			    &permitPrefix) != TCL_OK) {
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    continue;
-		case CONF_UNKNOWN:
-		    if (TclListObjLength(interp, objv[1], &len) != TCL_OK) {
-			if (allocatedMapFlag) {
-			    Tcl_DecrRefCount(mapObj);
-			}
-			return TCL_ERROR;
-		    }
-		    unknownObj = (len > 0 ? objv[1] : NULL);
-		    continue;
-		}
-	    }
-
-	    /*
-	     * Update the namespace now that we've finished the parsing stage.
-	     */
-
-	    flags = (permitPrefix ? flags|TCL_ENSEMBLE_PREFIX
-		    : flags&~TCL_ENSEMBLE_PREFIX);
-	    Tcl_SetEnsembleSubcommandList(interp, token, subcmdObj);
-	    Tcl_SetEnsembleMappingDict(interp, token, mapObj);
-	    Tcl_SetEnsembleParameterList(interp, token, paramObj);
-	    Tcl_SetEnsembleUnknownHandler(interp, token, unknownObj);
-	    Tcl_SetEnsembleFlags(interp, token, flags);
-	    return TCL_OK;
-	}
-
-    default:
-	Tcl_Panic("unexpected ensemble command");
-    }
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_CreateEnsemble --
- *
- *	Create a simple ensemble attached to the given namespace.
- *
- * Results:
- *	The token for the command created.
- *
- * Side effects:
- *	The ensemble is created and marked for compilation.
- *
- *----------------------------------------------------------------------
- */
-
-Tcl_Command
-Tcl_CreateEnsemble(
-    Tcl_Interp *interp,
-    const char *name,
-    Tcl_Namespace *namespacePtr,
-    int flags)
-{
-    Namespace *nsPtr = (Namespace *) namespacePtr;
-    EnsembleConfig *ensemblePtr = (EnsembleConfig *)
-	    ckalloc(sizeof(EnsembleConfig));
-    Tcl_Obj *nameObj = NULL;
-
-    if (nsPtr == NULL) {
-	nsPtr = (Namespace *) TclGetCurrentNamespace(interp);
-    }
-
-    /*
-     * Make the name of the ensemble into a fully qualified name. This might
-     * allocate a temporary object.
-     */
-
-    if (!(name[0] == ':' && name[1] == ':')) {
-	nameObj = Tcl_NewStringObj(nsPtr->fullName, -1);
-	if (nsPtr->parentPtr == NULL) {
-	    Tcl_AppendStringsToObj(nameObj, name, NULL);
-	} else {
-	    Tcl_AppendStringsToObj(nameObj, "::", name, NULL);
-	}
-	Tcl_IncrRefCount(nameObj);
-	name = TclGetString(nameObj);
-    }
-
-    ensemblePtr->nsPtr = nsPtr;
-    ensemblePtr->epoch = 0;
-    Tcl_InitHashTable(&ensemblePtr->subcommandTable, TCL_STRING_KEYS);
-    ensemblePtr->subcommandArrayPtr = NULL;
-    ensemblePtr->subcmdList = NULL;
-    ensemblePtr->subcommandDict = NULL;
-    ensemblePtr->flags = flags;
-    ensemblePtr->numParameters = 0;
-    ensemblePtr->parameterList = NULL;
-    ensemblePtr->unknownHandler = NULL;
-    ensemblePtr->token = Tcl_NRCreateCommand(interp, name,
-	    NsEnsembleImplementationCmd, NsEnsembleImplementationCmdNR,
-	    ensemblePtr, DeleteEnsembleConfig);
-    ensemblePtr->next = (EnsembleConfig *) nsPtr->ensembles;
-    nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr;
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    nsPtr->exportLookupEpoch++;
-
-    if (flags & ENSEMBLE_COMPILE) {
-	((Command *) ensemblePtr->token)->compileProc = TclCompileEnsemble;
-    }
-
-    if (nameObj != NULL) {
-	TclDecrRefCount(nameObj);
-    }
-    return ensemblePtr->token;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_SetEnsembleSubcommandList --
- *
- *	Set the subcommand list for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an ensemble
- *	or the subcommand list - if non-NULL - is not a list).
- *
- * Side effects:
- *	The ensemble is updated and marked for recompilation.
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_SetEnsembleSubcommandList(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj *subcmdList)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-    Tcl_Obj *oldList;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	return TCL_ERROR;
-    }
-    if (subcmdList != NULL) {
-	int length;
-
-	if (TclListObjLength(interp, subcmdList, &length) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	if (length < 1) {
-	    subcmdList = NULL;
-	}
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    oldList = ensemblePtr->subcmdList;
-    ensemblePtr->subcmdList = subcmdList;
-    if (subcmdList != NULL) {
-	Tcl_IncrRefCount(subcmdList);
-    }
-    if (oldList != NULL) {
-	TclDecrRefCount(oldList);
-    }
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    ensemblePtr->nsPtr->exportLookupEpoch++;
-
-    /*
-     * Special hack to make compiling of [info exists] work when the
-     * dictionary is modified.
-     */
-
-    if (cmdPtr->compileProc != NULL) {
-	((Interp *)interp)->compileEpoch++;
-    }
-
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_SetEnsembleParameterList --
- *
- *	Set the parameter list for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an ensemble
- *	or the parameter list - if non-NULL - is not a list).
- *
- * Side effects:
- *	The ensemble is updated and marked for recompilation.
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_SetEnsembleParameterList(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj *paramList)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-    Tcl_Obj *oldList;
-    int length;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	return TCL_ERROR;
-    }
-    if (paramList == NULL) {
-	length = 0;
-    } else {
-	if (TclListObjLength(interp, paramList, &length) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	if (length < 1) {
-	    paramList = NULL;
-	}
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    oldList = ensemblePtr->parameterList;
-    ensemblePtr->parameterList = paramList;
-    if (paramList != NULL) {
-	Tcl_IncrRefCount(paramList);
-    }
-    if (oldList != NULL) {
-	TclDecrRefCount(oldList);
-    }
-    ensemblePtr->numParameters = length;
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    ensemblePtr->nsPtr->exportLookupEpoch++;
-
-    /*
-     * Special hack to make compiling of [info exists] work when the
-     * dictionary is modified.
-     */
-
-    if (cmdPtr->compileProc != NULL) {
-	((Interp *)interp)->compileEpoch++;
-    }
-
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_SetEnsembleMappingDict --
- *
- *	Set the mapping dictionary for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an ensemble
- *	or the mapping - if non-NULL - is not a dict).
- *
- * Side effects:
- *	The ensemble is updated and marked for recompilation.
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_SetEnsembleMappingDict(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj *mapDict)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-    Tcl_Obj *oldDict;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	return TCL_ERROR;
-    }
-    if (mapDict != NULL) {
-	int size, done;
-	Tcl_DictSearch search;
-	Tcl_Obj *valuePtr;
-
-	if (Tcl_DictObjSize(interp, mapDict, &size) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-
-	for (Tcl_DictObjFirst(NULL, mapDict, &search, NULL, &valuePtr, &done);
-		!done; Tcl_DictObjNext(&search, NULL, &valuePtr, &done)) {
-	    Tcl_Obj *cmdPtr;
-	    const char *bytes;
-
-	    if (Tcl_ListObjIndex(interp, valuePtr, 0, &cmdPtr) != TCL_OK) {
-		Tcl_DictObjDone(&search);
-		return TCL_ERROR;
-	    }
-	    bytes = TclGetString(cmdPtr);
-	    if (bytes[0] != ':' || bytes[1] != ':') {
-		Tcl_AppendResult(interp,
-			"ensemble target is not a fully-qualified command",
-			NULL);
-		Tcl_DictObjDone(&search);
-		return TCL_ERROR;
-	    }
-	}
-
-	if (size < 1) {
-	    mapDict = NULL;
-	}
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    oldDict = ensemblePtr->subcommandDict;
-    ensemblePtr->subcommandDict = mapDict;
-    if (mapDict != NULL) {
-	Tcl_IncrRefCount(mapDict);
-    }
-    if (oldDict != NULL) {
-	TclDecrRefCount(oldDict);
-    }
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    ensemblePtr->nsPtr->exportLookupEpoch++;
-
-    /*
-     * Special hack to make compiling of [info exists] work when the
-     * dictionary is modified.
-     */
-
-    if (cmdPtr->compileProc != NULL) {
-	((Interp *)interp)->compileEpoch++;
-    }
-
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_SetEnsembleUnknownHandler --
- *
- *	Set the unknown handler for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an ensemble
- *	or the unknown handler - if non-NULL - is not a list).
- *
- * Side effects:
- *	The ensemble is updated and marked for recompilation.
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_SetEnsembleUnknownHandler(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj *unknownList)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-    Tcl_Obj *oldList;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	return TCL_ERROR;
-    }
-    if (unknownList != NULL) {
-	int length;
-
-	if (TclListObjLength(interp, unknownList, &length) != TCL_OK) {
-	    return TCL_ERROR;
-	}
-	if (length < 1) {
-	    unknownList = NULL;
-	}
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    oldList = ensemblePtr->unknownHandler;
-    ensemblePtr->unknownHandler = unknownList;
-    if (unknownList != NULL) {
-	Tcl_IncrRefCount(unknownList);
-    }
-    if (oldList != NULL) {
-	TclDecrRefCount(oldList);
-    }
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    ensemblePtr->nsPtr->exportLookupEpoch++;
-
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_SetEnsembleFlags --
- *
- *	Set the flags for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble).
- *
- * Side effects:
- *	The ensemble is updated and marked for recompilation.
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_SetEnsembleFlags(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    int flags)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-    int wasCompiled;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    wasCompiled = ensemblePtr->flags & ENSEMBLE_COMPILE;
-
-    /*
-     * This API refuses to set the ENS_DEAD flag...
-     */
-
-    ensemblePtr->flags &= ENS_DEAD;
-    ensemblePtr->flags |= flags & ~ENS_DEAD;
-
-    /*
-     * Trigger an eventual recomputation of the ensemble command set. Note
-     * that this is slightly tricky, as it means that we are not actually
-     * counting the number of namespace export actions, but it is the simplest
-     * way to go!
-     */
-
-    ensemblePtr->nsPtr->exportLookupEpoch++;
-
-    /*
-     * If the ENSEMBLE_COMPILE flag status was changed, install or remove the
-     * compiler function and bump the interpreter's compilation epoch so that
-     * bytecode gets regenerated.
-     */
-
-    if (flags & ENSEMBLE_COMPILE) {
-	if (!wasCompiled) {
-	    ((Command*) ensemblePtr->token)->compileProc = TclCompileEnsemble;
-	    ((Interp *) interp)->compileEpoch++;
-	}
-    } else {
-	if (wasCompiled) {
-	    ((Command*) ensemblePtr->token)->compileProc = NULL;
-	    ((Interp *) interp)->compileEpoch++;
-	}
-    }
-
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleSubcommandList --
- *
- *	Get the list of subcommands associated with a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). The list of subcommands is returned by updating the
- *	variable pointed to by the last parameter (NULL if this is to be
- *	derived from the mapping dictionary or the associated namespace's
- *	exported commands).
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleSubcommandList(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj **subcmdListPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *subcmdListPtr = ensemblePtr->subcmdList;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleParameterList --
- *
- *	Get the list of parameters associated with a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). The list of parameters is returned by updating the
- *	variable pointed to by the last parameter (NULL if there are
- *	no parameters).
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleParameterList(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj **paramListPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *paramListPtr = ensemblePtr->parameterList;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleMappingDict --
- *
- *	Get the command mapping dictionary associated with a particular
- *	ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). The mapping dict is returned by updating the variable
- *	pointed to by the last parameter (NULL if none is installed).
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleMappingDict(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj **mapDictPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *mapDictPtr = ensemblePtr->subcommandDict;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleUnknownHandler --
- *
- *	Get the unknown handler associated with a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). The unknown handler is returned by updating the variable
- *	pointed to by the last parameter (NULL if no handler is installed).
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleUnknownHandler(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Obj **unknownListPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *unknownListPtr = ensemblePtr->unknownHandler;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleFlags --
- *
- *	Get the flags for a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). The flags are returned by updating the variable pointed to
- *	by the last parameter.
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleFlags(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    int *flagsPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *flagsPtr = ensemblePtr->flags;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_GetEnsembleNamespace --
- *
- *	Get the namespace associated with a particular ensemble.
- *
- * Results:
- *	Tcl result code (error if command token does not indicate an
- *	ensemble). Namespace is returned by updating the variable pointed to
- *	by the last parameter.
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_GetEnsembleNamespace(
-    Tcl_Interp *interp,
-    Tcl_Command token,
-    Tcl_Namespace **namespacePtrPtr)
-{
-    Command *cmdPtr = (Command *) token;
-    EnsembleConfig *ensemblePtr;
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    ensemblePtr = cmdPtr->objClientData;
-    *namespacePtrPtr = (Tcl_Namespace *) ensemblePtr->nsPtr;
-    return TCL_OK;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_FindEnsemble --
- *
- *	Given a command name, get the ensemble token for it, allowing for
- *	[namespace import]s. [Bug 1017022]
- *
- * Results:
- *	The token for the ensemble command with the given name, or NULL if the
- *	command either does not exist or is not an ensemble (when an error
- *	message will be written into the interp if thats non-NULL).
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-Tcl_Command
-Tcl_FindEnsemble(
-    Tcl_Interp *interp,		/* Where to do the lookup, and where to write
-				 * the errors if TCL_LEAVE_ERR_MSG is set in
-				 * the flags. */
-    Tcl_Obj *cmdNameObj,	/* Name of command to look up. */
-    int flags)			/* Either 0 or TCL_LEAVE_ERR_MSG; other flags
-				 * are probably not useful. */
-{
-    Command *cmdPtr;
-
-    cmdPtr = (Command *)
-	    Tcl_FindCommand(interp, TclGetString(cmdNameObj), NULL, flags);
-    if (cmdPtr == NULL) {
-	return NULL;
-    }
-
-    if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	/*
-	 * Reuse existing infrastructure for following import link chains
-	 * rather than duplicating it.
-	 */
-
-	cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
-
-	if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd){
-	    if (flags & TCL_LEAVE_ERR_MSG) {
-		Tcl_AppendResult(interp, "\"", TclGetString(cmdNameObj),
-			"\" is not an ensemble command", NULL);
-		Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
-			TclGetString(cmdNameObj), NULL);
-	    }
-	    return NULL;
-	}
-    }
-
-    return (Tcl_Command) cmdPtr;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * Tcl_IsEnsemble --
- *
- *	Simple test for ensemble-hood that takes into account imported
- *	ensemble commands as well.
- *
- * Results:
- *	Boolean value
- *
- * Side effects:
- *	None
- *
- *----------------------------------------------------------------------
- */
-
-int
-Tcl_IsEnsemble(
-    Tcl_Command token)
-{
-    Command *cmdPtr = (Command *) token;
-    if (cmdPtr->objProc == NsEnsembleImplementationCmd) {
-	return 1;
-    }
-    cmdPtr = (Command *) TclGetOriginalCommand((Tcl_Command) cmdPtr);
-    if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	return 0;
-    }
-    return 1;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * TclMakeEnsemble --
- *
- *	Create an ensemble from a table of implementation commands. The
- *	ensemble will be subject to (limited) compilation if any of the
- *	implementation commands are compilable.
- *
- *	The 'name' parameter may be a single command name or a list if
- *	creating an ensemble subcommand (see the binary implementation).
- *
- *	Currently, the TCL_ENSEMBLE_PREFIX ensemble flag is only used on
- *	top-level ensemble commands.
- *
- * Results:
- *	Handle for the new ensemble, or NULL on failure.
- *
- * Side effects:
- *	May advance the bytecode compilation epoch.
- *
- *----------------------------------------------------------------------
- */
-
-Tcl_Command
-TclMakeEnsemble(
-    Tcl_Interp *interp,
-    const char *name,		 /* The ensemble name (as explained above) */
-    const EnsembleImplMap map[]) /* The subcommands to create */
-{
-    Tcl_Command ensemble;
-    Tcl_Namespace *ns;
-    Tcl_DString buf;
-    const char **nameParts = NULL;
-    const char *cmdName = NULL;
-    int i, nameCount = 0, ensembleFlags = 0;
-
-    /*
-     * Construct the path for the ensemble namespace and create it.
-     */
-
-    Tcl_DStringInit(&buf);
-    if (name[0] == ':' && name[1] == ':') {
-	/*
-	 * An absolute name, so use it directly.
-	 */
-
-	cmdName = name;
-	Tcl_DStringAppend(&buf, name, -1);
-	ensembleFlags = TCL_ENSEMBLE_PREFIX;
-    } else {
-	/*
-	 * Not an absolute name, so do munging of it. Note that this treats a
-	 * multi-word list differently to a single word.
-	 */
-
-	Tcl_DStringAppend(&buf, "::tcl", -1);
-
-	if (Tcl_SplitList(NULL, name, &nameCount, &nameParts) != TCL_OK) {
-	    Tcl_Panic("invalid ensemble name '%s'", name);
-	}
-
-	for (i = 0; i < nameCount; ++i) {
-	    Tcl_DStringAppend(&buf, "::", 2);
-	    Tcl_DStringAppend(&buf, nameParts[i], -1);
-	}
-    }
-
-    ns = Tcl_FindNamespace(interp, Tcl_DStringValue(&buf), NULL,
-	    TCL_CREATE_NS_IF_UNKNOWN);
-    if (!ns) {
-	Tcl_Panic("unable to find or create %s namespace!",
-		Tcl_DStringValue(&buf));
-    }
-
-    /*
-     * Create the named ensemble in the correct namespace
-     */
-
-    if (cmdName == NULL) {
-	if (nameCount == 1) {
-	    ensembleFlags = TCL_ENSEMBLE_PREFIX;
-	    cmdName = Tcl_DStringValue(&buf) + 5;
-	} else {
-	    ns = ns->parentPtr;
-	    cmdName = nameParts[nameCount - 1];
-	}
-    }
-    ensemble = Tcl_CreateEnsemble(interp, cmdName, ns, ensembleFlags);
-
-    /*
-     * Create the ensemble mapping dictionary and the ensemble command procs.
-     */
-
-    if (ensemble != NULL) {
-	Tcl_Obj *mapDict;
-
-	Tcl_DStringAppend(&buf, "::", 2);
-	TclNewObj(mapDict);
-	for (i=0 ; map[i].name != NULL ; i++) {
-	    Tcl_Obj *fromObj, *toObj;
-	    Command *cmdPtr;
-
-	    fromObj = Tcl_NewStringObj(map[i].name, -1);
-	    TclNewStringObj(toObj, Tcl_DStringValue(&buf),
-		    Tcl_DStringLength(&buf));
-	    Tcl_AppendToObj(toObj, map[i].name, -1);
-	    Tcl_DictObjPut(NULL, mapDict, fromObj, toObj);
-	    if (map[i].proc || map[i].nreProc) {
-		cmdPtr = (Command *)
-			Tcl_NRCreateCommand(interp, TclGetString(toObj),
-			map[i].proc, map[i].nreProc, map[i].clientData, NULL);
-		cmdPtr->compileProc = map[i].compileProc;
-		if (map[i].compileProc != NULL) {
-		    ensembleFlags |= ENSEMBLE_COMPILE;
-		}
-	    }
-	}
-	Tcl_SetEnsembleMappingDict(interp, ensemble, mapDict);
-	if (ensembleFlags & ENSEMBLE_COMPILE) {
-	    Tcl_SetEnsembleFlags(interp, ensemble, ensembleFlags);
-	}
-    }
-
-    Tcl_DStringFree(&buf);
-    if (nameParts != NULL) {
-	Tcl_Free((char *) nameParts);
-    }
-    return ensemble;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * NsEnsembleImplementationCmd --
- *
- *	Implements an ensemble of commands (being those exported by a
- *	namespace other than the global namespace) as a command with the same
- *	(short) name as the namespace in the parent namespace.
- *
- * Results:
- *	A standard Tcl result code. Will be TCL_ERROR if the command is not an
- *	unambiguous prefix of any command exported by the ensemble's
- *	namespace.
- *
- * Side effects:
- *	Depends on the command within the namespace that gets executed. If the
- *	ensemble itself returns TCL_ERROR, a descriptive error message will be
- *	placed in the interpreter's result.
- *
- *----------------------------------------------------------------------
- */
-
-static int
-NsEnsembleImplementationCmd(
-    ClientData clientData,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *const objv[])
-{
-    return Tcl_NRCallObjProc(interp, NsEnsembleImplementationCmdNR,
-	    clientData, objc, objv);
-}
-
-static int
-NsEnsembleImplementationCmdNR(
-    ClientData clientData,
-    Tcl_Interp *interp,
-    int objc,
-    Tcl_Obj *const objv[])
-{
-    EnsembleConfig *ensemblePtr = clientData;
-				/* The ensemble itself. */
-    Tcl_Obj *prefixObj;		/* An object containing the prefix words of
-				 * the command that implements the
-				 * subcommand. */
-    Tcl_HashEntry *hPtr;	/* Used for efficient lookup of fully
-				 * specified but not yet cached command
-				 * names. */
-    int reparseCount = 0;	/* Number of reparses. */
-
-    /*
-     * Must recheck objc, since numParameters might have changed. Cf. test
-     * namespace-53.9.
-     */
-
-  restartEnsembleParse:
-    if (objc < 2 + ensemblePtr->numParameters) {
-	/*
-	 * We don't have a subcommand argument. Make error message.
-	 */
-
-	Tcl_DString buf;	/* Message being built */
-	Tcl_Obj **elemPtrs;	/* Parameter names */
-	int len;		/* Number of parameters to append */
-
-	Tcl_DStringInit(&buf);
-	if (ensemblePtr->parameterList == NULL) {
-	    len = 0;
-	} else if (TclListObjGetElements(NULL, ensemblePtr->parameterList,
-		&len, &elemPtrs) != TCL_OK) {
-	    Tcl_Panic("List of ensemble parameters is not a list");
-	}
-	for (; len>0; len--,elemPtrs++) {
-	    Tcl_DStringAppend(&buf, Tcl_GetString(*elemPtrs), -1);
-	    Tcl_DStringAppend(&buf, " ", -1);
-	}
-	Tcl_DStringAppend(&buf, "subcommand ?arg ...?", -1);
-	Tcl_WrongNumArgs(interp, 1, objv, Tcl_DStringValue(&buf));
-	Tcl_DStringFree(&buf);
-
-	return TCL_ERROR;
-    }
-
-    if (ensemblePtr->nsPtr->flags & NS_DYING) {
-	/*
-	 * Don't know how we got here, but make things give up quickly.
-	 */
-
-	if (!Tcl_InterpDeleted(interp)) {
-	    Tcl_AppendResult(interp,
-		    "ensemble activated for deleted namespace", NULL);
-	}
-	return TCL_ERROR;
-    }
-
-    /*
-     * Determine if the table of subcommands is right. If so, we can just look
-     * up in there and go straight to dispatch.
-     */
-
-    if (ensemblePtr->epoch == ensemblePtr->nsPtr->exportLookupEpoch) {
-	/*
-	 * Table of subcommands is still valid; therefore there might be a
-	 * valid cache of discovered information which we can reuse. Do the
-	 * check here, and if we're still valid, we can jump straight to the
-	 * part where we do the invocation of the subcommand.
-	 */
-
-	if (objv[1+ensemblePtr->numParameters]->typePtr==&tclEnsembleCmdType){
-	    EnsembleCmdRep *ensembleCmd = objv[1+ensemblePtr->numParameters]
-		    ->internalRep.otherValuePtr;
-
-	    if (ensembleCmd->nsPtr == ensemblePtr->nsPtr &&
-		    ensembleCmd->epoch == ensemblePtr->epoch &&
-		    ensembleCmd->token == ensemblePtr->token) {
-		prefixObj = ensembleCmd->realPrefixObj;
-		Tcl_IncrRefCount(prefixObj);
-		goto runResultingSubcommand;
-	    }
-	}
-    } else {
-	BuildEnsembleConfig(ensemblePtr);
-	ensemblePtr->epoch = ensemblePtr->nsPtr->exportLookupEpoch;
-    }
-
-    /*
-     * Look in the hashtable for the subcommand name; this is the fastest way
-     * of all if there is no cache in operation.
-     */
-
-    hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable,
-	    TclGetString(objv[1 + ensemblePtr->numParameters]));
-    if (hPtr != NULL) {
-	char *fullName = Tcl_GetHashKey(&ensemblePtr->subcommandTable, hPtr);
-
-	prefixObj = Tcl_GetHashValue(hPtr);
-
-	/*
-	 * Cache for later in the subcommand object.
-	 */
-
-	MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters],
-		ensemblePtr, fullName, prefixObj);
-    } else if (!(ensemblePtr->flags & TCL_ENSEMBLE_PREFIX)) {
-	/*
-	 * Could not map, no prefixing, go to unknown/error handling.
-	 */
-
-	goto unknownOrAmbiguousSubcommand;
-    } else {
-	/*
-	 * If we've not already confirmed the command with the hash as part of
-	 * building our export table, we need to scan the sorted array for
-	 * matches.
-	 */
-
-	const char *subcmdName; /* Name of the subcommand, or unique prefix of
-				 * it (will be an error for a non-unique
-				 * prefix). */
-	char *fullName = NULL;	/* Full name of the subcommand. */
-	int stringLength, i;
-	int tableLength = ensemblePtr->subcommandTable.numEntries;
-
-	subcmdName = TclGetString(objv[1 + ensemblePtr->numParameters]);
-	stringLength = objv[1 + ensemblePtr->numParameters]->length;
-	for (i=0 ; i<tableLength ; i++) {
-	    register int cmp = strncmp(subcmdName,
-		    ensemblePtr->subcommandArrayPtr[i],
-		    (unsigned) stringLength);
-
-	    if (cmp == 0) {
-		if (fullName != NULL) {
-		    /*
-		     * Since there's never the exact-match case to worry about
-		     * (hash search filters this), getting here indicates that
-		     * our subcommand is an ambiguous prefix of (at least) two
-		     * exported subcommands, which is an error case.
-		     */
-
-		    goto unknownOrAmbiguousSubcommand;
-		}
-		fullName = ensemblePtr->subcommandArrayPtr[i];
-	    } else if (cmp < 0) {
-		/*
-		 * Because we are searching a sorted table, we can now stop
-		 * searching because we have gone past anything that could
-		 * possibly match.
-		 */
-
-		break;
-	    }
-	}
-	if (fullName == NULL) {
-	    /*
-	     * The subcommand is not a prefix of anything, so bail out!
-	     */
-
-	    goto unknownOrAmbiguousSubcommand;
-	}
-	hPtr = Tcl_FindHashEntry(&ensemblePtr->subcommandTable, fullName);
-	if (hPtr == NULL) {
-	    Tcl_Panic("full name %s not found in supposedly synchronized hash",
-		    fullName);
-	}
-	prefixObj = Tcl_GetHashValue(hPtr);
-
-	/*
-	 * Cache for later in the subcommand object.
-	 */
-
-	MakeCachedEnsembleCommand(objv[1 + ensemblePtr->numParameters],
-		ensemblePtr, fullName, prefixObj);
-    }
-
-    Tcl_IncrRefCount(prefixObj);
-  runResultingSubcommand:
-
-    /*
-     * Do the real work of execution of the subcommand by building an array of
-     * objects (note that this is potentially not the same length as the
-     * number of arguments to this ensemble command), populating it and then
-     * feeding it back through the main command-lookup engine. In theory, we
-     * could look up the command in the namespace ourselves, as we already
-     * have the namespace in which it is guaranteed to exist,
-     *
-     *   ((Q: That's not true if the -map option is used, is it?))
-     *
-     * but we don't do that (the cacheing of the command object used should
-     * help with that.)
-     */
-
-    {
-	Tcl_Obj **prefixObjv;	/* The list of objects to substitute in as the
-				 * target command prefix. */
-	Tcl_Obj *copyPtr;	/* The actual list of words to dispatch to.
-				 * Will be freed by the dispatch engine. */
-	int prefixObjc, copyObjc;
-	Interp *iPtr = (Interp *) interp;
-
-	/*
-	 * Get the prefix that we're rewriting to. To do this we need to
-	 * ensure that the internal representation of the list does not change
-	 * so that we can safely keep the internal representations of the
-	 * elements in the list.
-	 *
-	 * TODO: Use conventional list operations to make this code sane!
-	 */
-
-	TclListObjGetElements(NULL, prefixObj, &prefixObjc, &prefixObjv);
-
-	copyObjc = objc - 2 + prefixObjc;
-	copyPtr = Tcl_NewListObj(copyObjc, NULL);
-	if (copyObjc > 0) {
-	    register Tcl_Obj **copyObjv;
-				/* Space used to construct the list of
-				 * arguments to pass to the command that
-				 * implements the ensemble subcommand. */
-	    register List *listRepPtr = copyPtr->internalRep.twoPtrValue.ptr1;
-	    register int i;
-
-	    listRepPtr->elemCount = copyObjc;
-	    copyObjv = &listRepPtr->elements;
-	    memcpy(copyObjv, prefixObjv, sizeof(Tcl_Obj *) * prefixObjc);
-	    memcpy(copyObjv+prefixObjc, objv+1,
-		    sizeof(Tcl_Obj *) * ensemblePtr->numParameters);
-	    memcpy(copyObjv+prefixObjc+ensemblePtr->numParameters,
-		    objv+ensemblePtr->numParameters+2,
-		    sizeof(Tcl_Obj *) * (objc-ensemblePtr->numParameters-2));
-
-	    for (i=0; i < copyObjc; i++) {
-		Tcl_IncrRefCount(copyObjv[i]);
-	    }
-	}
-	TclDecrRefCount(prefixObj);
-
-	/*
-	 * Record what arguments the script sent in so that things like
-	 * Tcl_WrongNumArgs can give the correct error message. Parameters
-	 * count both as inserted and removed arguments.
-	 */
-
-#if 0
-	if (TclInitRewriteEnsemble(interp, 2 + ensemblePtr->numParameters, prefixObjc + ensemblePtr->numParameters, objv)) {
-	    TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL, NULL);
-	}
-#else
-	if (iPtr->ensembleRewrite.sourceObjs == NULL) {
-	    iPtr->ensembleRewrite.sourceObjs = objv;
-	    iPtr->ensembleRewrite.numRemovedObjs =
-		    2 + ensemblePtr->numParameters;
-	    iPtr->ensembleRewrite.numInsertedObjs =
-		    prefixObjc + ensemblePtr->numParameters;
-	    TclNRAddCallback(interp, TclClearRootEnsemble, NULL, NULL, NULL,
-		    NULL);
-	} else {
-	    register int ni = 2 + ensemblePtr->numParameters
-		    - iPtr->ensembleRewrite.numInsertedObjs;
-				/* Position in objv of new front of insertion
-				 * relative to old one. */
-	    if (ni > 0) {
-		iPtr->ensembleRewrite.numRemovedObjs += ni;
-		iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-1;
-	    } else {
-		iPtr->ensembleRewrite.numInsertedObjs += prefixObjc-2;
-	    }
-	}
-#endif
-
-	/*
-	 * Hand off to the target command.
-	 */
-
-	iPtr->evalFlags |= TCL_EVAL_REDIRECT;	
-	return Tcl_NREvalObj(interp, copyPtr, TCL_EVAL_INVOKE);
-    }
-
-  unknownOrAmbiguousSubcommand:
-    /*
-     * Have not been able to match the subcommand asked for with a real
-     * subcommand that we export. See whether a handler has been registered
-     * for dealing with this situation. Will only call (at most) once for any
-     * particular ensemble invocation.
-     */
-
-    if (ensemblePtr->unknownHandler != NULL && reparseCount++ < 1) {
-	switch (EnsembleUnknownCallback(interp, ensemblePtr, objc, objv,
-		&prefixObj)) {
-	case TCL_OK:
-	    goto runResultingSubcommand;
-	case TCL_ERROR:
-	    return TCL_ERROR;
-	case TCL_CONTINUE:
-	    goto restartEnsembleParse;
-	}
-    }
-
-    /*
-     * We cannot determine what subcommand to hand off to, so generate a
-     * (standard) failure message. Note the one odd case compared with
-     * standard ensemble-like command, which is where a namespace has no
-     * exported commands at all...
-     */
-
-    Tcl_ResetResult(interp);
-    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
-	    TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
-    if (ensemblePtr->subcommandTable.numEntries == 0) {
-	Tcl_AppendResult(interp, "unknown subcommand \"",
-		TclGetString(objv[1+ensemblePtr->numParameters]),
-		"\": namespace ", ensemblePtr->nsPtr->fullName,
-		" does not export any commands", NULL);
-	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
-		TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
-	return TCL_ERROR;
-    }
-    Tcl_AppendResult(interp, "unknown ",
-	    (ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? "or ambiguous " : ""),
-	    "subcommand \"", TclGetString(objv[1+ensemblePtr->numParameters]),
-	    "\": must be ", NULL);
-    if (ensemblePtr->subcommandTable.numEntries == 1) {
-	Tcl_AppendResult(interp, ensemblePtr->subcommandArrayPtr[0], NULL);
-    } else {
-	int i;
-
-	for (i=0 ; i<ensemblePtr->subcommandTable.numEntries-1 ; i++) {
-	    Tcl_AppendResult(interp,
-		    ensemblePtr->subcommandArrayPtr[i], ", ", NULL);
-	}
-	Tcl_AppendResult(interp, "or ",
-		ensemblePtr->subcommandArrayPtr[i], NULL);
-    }
-    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
-	    TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
-    return TCL_ERROR;
-}
-
-int
-TclClearRootEnsemble(
-    ClientData data[],
-    Tcl_Interp *interp,
-    int result)
-{
-    TclResetRewriteEnsemble(interp, 1);
-    return result;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * TclInitRewriteEnsemble --
- *
- *	Applies a rewrite of arguments so that an ensemble subcommand will
- *	report error messages correctly for the overall command.
- *
- * Results:
- *	Whether this is the first rewrite applied, a value which must be
- *	passed to TclResetRewriteEnsemble when undoing this command's
- *	behaviour.
- *
- * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
- */
-
-int
-TclInitRewriteEnsemble(
-    Tcl_Interp *interp,
-    int numRemoved,
-    int numInserted,
-    Tcl_Obj *const *objv)
-{
-    Interp *iPtr = (Interp *) interp;
-
-    int isRootEnsemble = (iPtr->ensembleRewrite.sourceObjs == NULL);
-
-    if (isRootEnsemble) {
-        iPtr->ensembleRewrite.sourceObjs = objv;
-        iPtr->ensembleRewrite.numRemovedObjs = numRemoved;
-        iPtr->ensembleRewrite.numInsertedObjs = numInserted;
-    } else {
-        int numIns = iPtr->ensembleRewrite.numInsertedObjs;
-
-        if (numIns < numRemoved) {
-            iPtr->ensembleRewrite.numRemovedObjs += numRemoved - numIns;
-            iPtr->ensembleRewrite.numInsertedObjs += numInserted - 1;
-        } else {
-            iPtr->ensembleRewrite.numInsertedObjs += numInserted - numRemoved;
-        }
-    }
-    return isRootEnsemble;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * TclResetRewriteEnsemble --
- *
- *	Removes any rewrites applied to support proper reporting of error
- *	messages used in ensembles. Should be paired with
- *	TclInitRewriteEnsemble.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
- */
-
-void
-TclResetRewriteEnsemble(
-    Tcl_Interp *interp,
-    int isRootEnsemble)
-{
-    Interp *iPtr = (Interp *) interp;
-
-    if (isRootEnsemble) {
-        iPtr->ensembleRewrite.sourceObjs = NULL;
-        iPtr->ensembleRewrite.numRemovedObjs = 0;
-        iPtr->ensembleRewrite.numInsertedObjs = 0;
-    }
-}
-
-/*
- * ----------------------------------------------------------------------
- *
- * EnsmebleUnknownCallback --
- *
- *	Helper for the ensemble engine that handles the procesing of unknown
- *	callbacks. See the user documentation of the ensemble unknown handler
- *	for details; this function is only ever called when such a function is
- *	defined, and is only ever called once per ensemble dispatch (i.e. if a
- *	reparse still fails, this isn't called again).
- *
- * Results:
- *	TCL_OK -	*prefixObjPtr contains the command words to dispatch
- *			to.
- *	TCL_CONTINUE -	Need to reparse (*prefixObjPtr is invalid).
- *	TCL_ERROR -	Something went wrong! Error message in interpreter.
- *
- * Side effects:
- *	Calls the Tcl interpreter, so arbitrary.
- *
- * ----------------------------------------------------------------------
- */
-
-static inline int
-EnsembleUnknownCallback(
-    Tcl_Interp *interp,
-    EnsembleConfig *ensemblePtr,
-    int objc,
-    Tcl_Obj *const objv[],
-    Tcl_Obj **prefixObjPtr)
-{
-    int paramc, i, result, prefixObjc;
-    Tcl_Obj **paramv, *unknownCmd, *ensObj;
-    char buf[TCL_INTEGER_SPACE];
-
-    /*
-     * Create the unknown command callback to determine what to do.
-     */
-
-    unknownCmd = Tcl_DuplicateObj(ensemblePtr->unknownHandler);
-    TclNewObj(ensObj);
-    Tcl_GetCommandFullName(interp, ensemblePtr->token, ensObj);
-    Tcl_ListObjAppendElement(NULL, unknownCmd, ensObj);
-    for (i=1 ; i<objc ; i++) {
-	Tcl_ListObjAppendElement(NULL, unknownCmd, objv[i]);
-    }
-    TclListObjGetElements(NULL, unknownCmd, &paramc, &paramv);
-    Tcl_IncrRefCount(unknownCmd);
-
-    /*
-     * Now call the unknown handler. (We don't bother NRE-enabling this; deep
-     * recursing through unknown handlers is horribly perverse.) Note that it
-     * is always an error for an unknown handler to delete its ensemble; don't
-     * do that!
-     */
-
-    Tcl_Preserve(ensemblePtr);
-    ((Interp *)interp)->evalFlags |= TCL_EVAL_REDIRECT;    
-    result = Tcl_EvalObjv(interp, paramc, paramv, 0);
-    if ((result == TCL_OK) && (ensemblePtr->flags & ENS_DEAD)) {
-	Tcl_SetResult(interp,
-		"unknown subcommand handler deleted its ensemble",
-		TCL_STATIC);
-	result = TCL_ERROR;
-    }
-    Tcl_Release(ensemblePtr);
-
-    /*
-     * If we succeeded, we should either have a list of words that form the
-     * command to be executed, or an empty list. In the empty-list case, the
-     * ensemble is believed to be updated so we should ask the ensemble engine
-     * to reparse the original command.
-     */
-
-    if (result == TCL_OK) {
-	*prefixObjPtr = Tcl_GetObjResult(interp);
-	Tcl_IncrRefCount(*prefixObjPtr);
-	TclDecrRefCount(unknownCmd);
-	Tcl_ResetResult(interp);
-
-	/*
-	 * Namespace is still there. Check if the result is a valid list. If
-	 * it is, and it is non-empty, that list is what we are using as our
-	 * replacement.
-	 */
-
-	if (TclListObjLength(interp, *prefixObjPtr, &prefixObjc) != TCL_OK) {
-	    TclDecrRefCount(*prefixObjPtr);
-	    Tcl_AddErrorInfo(interp, "\n    while parsing result of "
-		    "ensemble unknown subcommand handler");
-	    return TCL_ERROR;
-	}
-	if (prefixObjc > 0) {
-	    return TCL_OK;
-	}
-
-	/*
-	 * Namespace alive & empty result => reparse.
-	 */
-
-	TclDecrRefCount(*prefixObjPtr);
-	return TCL_CONTINUE;
-    }
-
-    /*
-     * Oh no! An exceptional result. Convert to an error.
-     */
-
-    if (!Tcl_InterpDeleted(interp)) {
-	if (result != TCL_ERROR) {
-	    Tcl_ResetResult(interp);
-	    Tcl_SetResult(interp,
-		    "unknown subcommand handler returned bad code: ",
-		    TCL_STATIC);
-	    switch (result) {
-	    case TCL_RETURN:
-		Tcl_AppendResult(interp, "return", NULL);
-		break;
-	    case TCL_BREAK:
-		Tcl_AppendResult(interp, "break", NULL);
-		break;
-	    case TCL_CONTINUE:
-		Tcl_AppendResult(interp, "continue", NULL);
-		break;
-	    default:
-		sprintf(buf, "%d", result);
-		Tcl_AppendResult(interp, buf, NULL);
-	    }
-	    Tcl_AddErrorInfo(interp, "\n    result of "
-		    "ensemble unknown subcommand handler: ");
-	    Tcl_AddErrorInfo(interp, TclGetString(unknownCmd));
-	} else {
-	    Tcl_AddErrorInfo(interp,
-		    "\n    (ensemble unknown subcommand handler)");
-	}
-    }
-    TclDecrRefCount(unknownCmd);
-    return TCL_ERROR;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * MakeCachedEnsembleCommand --
- *
- *	Cache what we've computed so far; it's not nice to repeatedly copy
- *	strings about. Note that to do this, we start by deleting any old
- *	representation that there was (though if it was an out of date
- *	ensemble rep, we can skip some of the deallocation process.)
- *
- * Results:
- *	None
- *
- * Side effects:
- *	Alters the internal representation of the first object parameter.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-MakeCachedEnsembleCommand(
-    Tcl_Obj *objPtr,
-    EnsembleConfig *ensemblePtr,
-    const char *subcommandName,
-    Tcl_Obj *prefixObjPtr)
-{
-    register EnsembleCmdRep *ensembleCmd;
-    int length;
-
-    if (objPtr->typePtr == &tclEnsembleCmdType) {
-	ensembleCmd = objPtr->internalRep.otherValuePtr;
-	Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
-	ensembleCmd->nsPtr->refCount--;
-	if ((ensembleCmd->nsPtr->refCount == 0)
-		&& (ensembleCmd->nsPtr->flags & NS_DEAD)) {
-	    NamespaceFree(ensembleCmd->nsPtr);
-	}
-	ckfree(ensembleCmd->fullSubcmdName);
-    } else {
-	/*
-	 * Kill the old internal rep, and replace it with a brand new one of
-	 * our own.
-	 */
-
-	TclFreeIntRep(objPtr);
-	ensembleCmd = (EnsembleCmdRep *) ckalloc(sizeof(EnsembleCmdRep));
-	objPtr->internalRep.otherValuePtr = ensembleCmd;
-	objPtr->typePtr = &tclEnsembleCmdType;
-    }
-
-    /*
-     * Populate the internal rep.
-     */
-
-    ensembleCmd->nsPtr = ensemblePtr->nsPtr;
-    ensembleCmd->epoch = ensemblePtr->epoch;
-    ensembleCmd->token = ensemblePtr->token;
-    ensemblePtr->nsPtr->refCount++;
-    ensembleCmd->realPrefixObj = prefixObjPtr;
-    length = strlen(subcommandName)+1;
-    ensembleCmd->fullSubcmdName = ckalloc((unsigned) length);
-    memcpy(ensembleCmd->fullSubcmdName, subcommandName, (unsigned) length);
-    Tcl_IncrRefCount(ensembleCmd->realPrefixObj);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * DeleteEnsembleConfig --
- *
- *	Destroys the data structure used to represent an ensemble. This is
- *	called when the ensemble's command is deleted (which happens
- *	automatically if the ensemble's namespace is deleted.) Maintainers
- *	should note that ensembles should be deleted by deleting their
- *	commands.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Memory is (eventually) deallocated.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-DeleteEnsembleConfig(
-    ClientData clientData)
-{
-    EnsembleConfig *ensemblePtr = clientData;
-    Namespace *nsPtr = ensemblePtr->nsPtr;
-    Tcl_HashSearch search;
-    Tcl_HashEntry *hEnt;
-
-    /*
-     * Unlink from the ensemble chain if it has not been marked as having been
-     * done already.
-     */
-
-    if (ensemblePtr->next != ensemblePtr) {
-	EnsembleConfig *ensPtr = (EnsembleConfig *) nsPtr->ensembles;
-	if (ensPtr == ensemblePtr) {
-	    nsPtr->ensembles = (Tcl_Ensemble *) ensemblePtr->next;
-	} else {
-	    while (ensPtr != NULL) {
-		if (ensPtr->next == ensemblePtr) {
-		    ensPtr->next = ensemblePtr->next;
-		    break;
-		}
-		ensPtr = ensPtr->next;
-	    }
-	}
-    }
-
-    /*
-     * Mark the namespace as dead so code that uses Tcl_Preserve() can tell
-     * whether disaster happened anyway.
-     */
-
-    ensemblePtr->flags |= ENS_DEAD;
-
-    /*
-     * Kill the pointer-containing fields.
-     */
-
-    if (ensemblePtr->subcommandTable.numEntries != 0) {
-	ckfree((char *) ensemblePtr->subcommandArrayPtr);
-    }
-    hEnt = Tcl_FirstHashEntry(&ensemblePtr->subcommandTable, &search);
-    while (hEnt != NULL) {
-	Tcl_Obj *prefixObj = Tcl_GetHashValue(hEnt);
-
-	Tcl_DecrRefCount(prefixObj);
-	hEnt = Tcl_NextHashEntry(&search);
-    }
-    Tcl_DeleteHashTable(&ensemblePtr->subcommandTable);
-    if (ensemblePtr->subcmdList != NULL) {
-	Tcl_DecrRefCount(ensemblePtr->subcmdList);
-    }
-    if (ensemblePtr->parameterList != NULL) {
-	Tcl_DecrRefCount(ensemblePtr->parameterList);
-    }
-    if (ensemblePtr->subcommandDict != NULL) {
-	Tcl_DecrRefCount(ensemblePtr->subcommandDict);
-    }
-    if (ensemblePtr->unknownHandler != NULL) {
-	Tcl_DecrRefCount(ensemblePtr->unknownHandler);
-    }
-
-    /*
-     * Arrange for the structure to be reclaimed. Note that this is complex
-     * because we have to make sure that we can react sensibly when an
-     * ensemble is deleted during the process of initialising the ensemble
-     * (especially the unknown callback.)
-     */
-
-    Tcl_EventuallyFree(ensemblePtr, TCL_DYNAMIC);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * BuildEnsembleConfig --
- *
- *	Create the internal data structures that describe how an ensemble
- *	looks, being a hash mapping from the full command name to the Tcl list
- *	that describes the implementation prefix words, and a sorted array of
- *	all the full command names to allow for reasonably efficient
- *	unambiguous prefix handling.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Reallocates and rebuilds the hash table and array stored at the
- *	ensemblePtr argument. For large ensembles or large namespaces, this is
- *	a potentially expensive operation.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-BuildEnsembleConfig(
-    EnsembleConfig *ensemblePtr)
-{
-    Tcl_HashSearch search;	/* Used for scanning the set of commands in
-				 * the namespace that backs up this
-				 * ensemble. */
-    int i, j, isNew;
-    Tcl_HashTable *hash = &ensemblePtr->subcommandTable;
-    Tcl_HashEntry *hPtr;
-
-    if (hash->numEntries != 0) {
-	/*
-	 * Remove pre-existing table.
-	 */
-
-	Tcl_HashSearch search;
-
-	ckfree((char *) ensemblePtr->subcommandArrayPtr);
-	hPtr = Tcl_FirstHashEntry(hash, &search);
-	while (hPtr != NULL) {
-	    Tcl_Obj *prefixObj = Tcl_GetHashValue(hPtr);
-	    Tcl_DecrRefCount(prefixObj);
-	    hPtr = Tcl_NextHashEntry(&search);
-	}
-	Tcl_DeleteHashTable(hash);
-	Tcl_InitHashTable(hash, TCL_STRING_KEYS);
-    }
-
-    /*
-     * See if we've got an export list. If so, we will only export exactly
-     * those commands, which may be either implemented by the prefix in the
-     * subcommandDict or mapped directly onto the namespace's commands.
-     */
-
-    if (ensemblePtr->subcmdList != NULL) {
-	Tcl_Obj **subcmdv, *target, *cmdObj, *cmdPrefixObj;
-	int subcmdc;
-
-	TclListObjGetElements(NULL, ensemblePtr->subcmdList, &subcmdc,
-		&subcmdv);
-	for (i=0 ; i<subcmdc ; i++) {
-	    const char *name = TclGetString(subcmdv[i]);
-
-	    hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
-
-	    /*
-	     * Skip non-unique cases.
-	     */
-
-	    if (!isNew) {
-		continue;
-	    }
-
-	    /*
-	     * Look in our dictionary (if present) for the command.
-	     */
-
-	    if (ensemblePtr->subcommandDict != NULL) {
-		Tcl_DictObjGet(NULL, ensemblePtr->subcommandDict, subcmdv[i],
-			&target);
-		if (target != NULL) {
-		    Tcl_SetHashValue(hPtr, target);
-		    Tcl_IncrRefCount(target);
-		    continue;
-		}
-	    }
-
-	    /*
-	     * Not there, so map onto the namespace. Note in this case that we
-	     * do not guarantee that the command is actually there; that is
-	     * the programmer's responsibility (or [::unknown] of course).
-	     */
-
-	    cmdObj = Tcl_NewStringObj(ensemblePtr->nsPtr->fullName, -1);
-	    if (ensemblePtr->nsPtr->parentPtr != NULL) {
-		Tcl_AppendStringsToObj(cmdObj, "::", name, NULL);
-	    } else {
-		Tcl_AppendStringsToObj(cmdObj, name, NULL);
-	    }
-	    cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
-	    Tcl_SetHashValue(hPtr, cmdPrefixObj);
-	    Tcl_IncrRefCount(cmdPrefixObj);
-	}
-    } else if (ensemblePtr->subcommandDict != NULL) {
-	/*
-	 * No subcmd list, but we do have a mapping dictionary so we should
-	 * use the keys of that. Convert the dictionary's contents into the
-	 * form required for the ensemble's internal hashtable.
-	 */
-
-	Tcl_DictSearch dictSearch;
-	Tcl_Obj *keyObj, *valueObj;
-	int done;
-
-	Tcl_DictObjFirst(NULL, ensemblePtr->subcommandDict, &dictSearch,
-		&keyObj, &valueObj, &done);
-	while (!done) {
-	    const char *name = TclGetString(keyObj);
-
-	    hPtr = Tcl_CreateHashEntry(hash, name, &isNew);
-	    Tcl_SetHashValue(hPtr, valueObj);
-	    Tcl_IncrRefCount(valueObj);
-	    Tcl_DictObjNext(&dictSearch, &keyObj, &valueObj, &done);
-	}
-    } else {
-	/*
-	 * Discover what commands are actually exported by the namespace.
-	 * What we have is an array of patterns and a hash table whose keys
-	 * are the command names exported by the namespace (the contents do
-	 * not matter here.) We must find out what commands are actually
-	 * exported by filtering each command in the namespace against each of
-	 * the patterns in the export list. Note that we use an intermediate
-	 * hash table to make memory management easier, and because that makes
-	 * exact matching far easier too.
-	 *
-	 * Suggestion for future enhancement: compute the unique prefixes and
-	 * place them in the hash too, which should make for even faster
-	 * matching.
-	 */
-
-	hPtr = Tcl_FirstHashEntry(&ensemblePtr->nsPtr->cmdTable, &search);
-	for (; hPtr!= NULL ; hPtr=Tcl_NextHashEntry(&search)) {
-	    char *nsCmdName =		/* Name of command in namespace. */
-		    Tcl_GetHashKey(&ensemblePtr->nsPtr->cmdTable, hPtr);
-
-	    for (i=0 ; i<ensemblePtr->nsPtr->numExportPatterns ; i++) {
-		if (Tcl_StringMatch(nsCmdName,
-			ensemblePtr->nsPtr->exportArrayPtr[i])) {
-		    hPtr = Tcl_CreateHashEntry(hash, nsCmdName, &isNew);
-
-		    /*
-		     * Remember, hash entries have a full reference to the
-		     * substituted part of the command (as a list) as their
-		     * content!
-		     */
-
-		    if (isNew) {
-			Tcl_Obj *cmdObj, *cmdPrefixObj;
-
-			TclNewObj(cmdObj);
-			Tcl_AppendStringsToObj(cmdObj,
-				ensemblePtr->nsPtr->fullName,
-				(ensemblePtr->nsPtr->parentPtr ? "::" : ""),
-				nsCmdName, NULL);
-			cmdPrefixObj = Tcl_NewListObj(1, &cmdObj);
-			Tcl_SetHashValue(hPtr, cmdPrefixObj);
-			Tcl_IncrRefCount(cmdPrefixObj);
-		    }
-		    break;
-		}
-	    }
-	}
-    }
-
-    if (hash->numEntries == 0) {
-	ensemblePtr->subcommandArrayPtr = NULL;
-	return;
-    }
-
-    /*
-     * Create a sorted array of all subcommands in the ensemble; hash tables
-     * are all very well for a quick look for an exact match, but they can't
-     * determine things like whether a string is a prefix of another (not
-     * without lots of preparation anyway) and they're no good for when we're
-     * generating the error message either.
-     *
-     * We do this by filling an array with the names (we use the hash keys
-     * directly to save a copy, since any time we change the array we change
-     * the hash too, and vice versa) and running quicksort over the array.
-     */
-
-    ensemblePtr->subcommandArrayPtr = (char **)
-	    ckalloc(sizeof(char *) * hash->numEntries);
-
-    /*
-     * Fill array from both ends as this makes us less likely to end up with
-     * performance problems in qsort(), which is good. Note that doing this
-     * makes this code much more opaque, but the naive alternatve:
-     *
-     * for (hPtr=Tcl_FirstHashEntry(hash,&search),i=0 ;
-     *	       hPtr!=NULL ; hPtr=Tcl_NextHashEntry(&search),i++) {
-     *     ensemblePtr->subcommandArrayPtr[i] = Tcl_GetHashKey(hash, &hPtr);
-     * }
-     *
-     * can produce long runs of precisely ordered table entries when the
-     * commands in the namespace are declared in a sorted fashion (an ordering
-     * some people like) and the hashing functions (or the command names
-     * themselves) are fairly unfortunate. By filling from both ends, it
-     * requires active malice (and probably a debugger) to get qsort() to have
-     * awful runtime behaviour.
-     */
-
-    i = 0;
-    j = hash->numEntries;
-    hPtr = Tcl_FirstHashEntry(hash, &search);
-    while (hPtr != NULL) {
-	ensemblePtr->subcommandArrayPtr[i++] = Tcl_GetHashKey(hash, hPtr);
-	hPtr = Tcl_NextHashEntry(&search);
-	if (hPtr == NULL) {
-	    break;
-	}
-	ensemblePtr->subcommandArrayPtr[--j] = Tcl_GetHashKey(hash, hPtr);
-	hPtr = Tcl_NextHashEntry(&search);
-    }
-    if (hash->numEntries > 1) {
-	qsort(ensemblePtr->subcommandArrayPtr, (unsigned)hash->numEntries,
-		sizeof(char *), NsEnsembleStringOrder);
-    }
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * NsEnsembleStringOrder --
- *
- *	Helper function to compare two pointers to two strings for use with
- *	qsort().
- *
- * Results:
- *	-1 if the first string is smaller, 1 if the second string is smaller,
- *	and 0 if they are equal.
- *
- * Side effects:
- *	None.
- *
- *----------------------------------------------------------------------
- */
-
-static int
-NsEnsembleStringOrder(
-    const void *strPtr1,
-    const void *strPtr2)
-{
-    return strcmp(*(const char **)strPtr1, *(const char **)strPtr2);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * FreeEnsembleCmdRep --
- *
- *	Destroys the internal representation of a Tcl_Obj that has been
- *	holding information about a command in an ensemble.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Memory is deallocated. If this held the last reference to a
- *	namespace's main structure, that main structure will also be
- *	destroyed.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-FreeEnsembleCmdRep(
-    Tcl_Obj *objPtr)
-{
-    EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
-
-    Tcl_DecrRefCount(ensembleCmd->realPrefixObj);
-    ckfree(ensembleCmd->fullSubcmdName);
-    ensembleCmd->nsPtr->refCount--;
-    if ((ensembleCmd->nsPtr->refCount == 0)
-	    && (ensembleCmd->nsPtr->flags & NS_DEAD)) {
-	NamespaceFree(ensembleCmd->nsPtr);
-    }
-    ckfree((char *) ensembleCmd);
-    objPtr->typePtr = NULL;
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * DupEnsembleCmdRep --
- *
- *	Makes one Tcl_Obj into a copy of another that is a subcommand of an
- *	ensemble.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	Memory is allocated, and the namespace that the ensemble is built on
- *	top of gains another reference.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-DupEnsembleCmdRep(
-    Tcl_Obj *objPtr,
-    Tcl_Obj *copyPtr)
-{
-    EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
-    EnsembleCmdRep *ensembleCopy = (EnsembleCmdRep *)
-	    ckalloc(sizeof(EnsembleCmdRep));
-    int length = strlen(ensembleCmd->fullSubcmdName);
-
-    copyPtr->typePtr = &tclEnsembleCmdType;
-    copyPtr->internalRep.otherValuePtr = ensembleCopy;
-    ensembleCopy->nsPtr = ensembleCmd->nsPtr;
-    ensembleCopy->epoch = ensembleCmd->epoch;
-    ensembleCopy->token = ensembleCmd->token;
-    ensembleCopy->nsPtr->refCount++;
-    ensembleCopy->realPrefixObj = ensembleCmd->realPrefixObj;
-    Tcl_IncrRefCount(ensembleCopy->realPrefixObj);
-    ensembleCopy->fullSubcmdName = ckalloc((unsigned) length+1);
-    memcpy(ensembleCopy->fullSubcmdName, ensembleCmd->fullSubcmdName,
-	    (unsigned) length+1);
-}
-
-/*
- *----------------------------------------------------------------------
- *
- * StringOfEnsembleCmdRep --
- *
- *	Creates a string representation of a Tcl_Obj that holds a subcommand
- *	of an ensemble.
- *
- * Results:
- *	None.
- *
- * Side effects:
- *	The object gains a string (UTF-8) representation.
- *
- *----------------------------------------------------------------------
- */
-
-static void
-StringOfEnsembleCmdRep(
-    Tcl_Obj *objPtr)
-{
-    EnsembleCmdRep *ensembleCmd = objPtr->internalRep.otherValuePtr;
-    int length = strlen(ensembleCmd->fullSubcmdName);
-
-    objPtr->length = length;
-    objPtr->bytes = ckalloc((unsigned) length+1);
-    memcpy(objPtr->bytes, ensembleCmd->fullSubcmdName, (unsigned) length+1);
-}
-
-/*
- *----------------------------------------------------------------------
- *
  * Tcl_LogCommandInfo --
  *
  *	This function is invoked after an error occurs in an interpreter. It