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-rw-r--r--generic/tclBasic.c58
1 files changed, 55 insertions, 3 deletions
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index 44484c3..a570491 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -11,7 +11,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * SCCS: %Z% $Id: tclBasic.c,v 1.9 1998/07/20 16:43:31 welch Exp $
+ * SCCS: %Z% $Id: tclBasic.c,v 1.10 1998/08/10 15:43:41 welch Exp $
*/
#include "tclInt.h"
@@ -1415,11 +1415,13 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
* when this command is deleted. */
{
Interp *iPtr = (Interp *) interp;
+ ImportRef *oldRefPtr = NULL;
Namespace *nsPtr, *dummy1, *dummy2;
- Command *cmdPtr;
+ Command *cmdPtr, *refCmdPtr;
Tcl_HashEntry *hPtr;
char *tail;
int new, result;
+ ImportedCmdData *dataPtr;
if (iPtr->flags & DELETED) {
/*
@@ -1452,9 +1454,15 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
if (!new) {
/*
* Command already exists. Delete the old one.
+ * Be careful to preserve any existing import links so we can
+ * restore them down below. That way, you can redefine a
+ * command and its import status will remain intact.
*/
cmdPtr = (Command *) Tcl_GetHashValue(hPtr);
+ oldRefPtr = cmdPtr->importRefPtr;
+ cmdPtr->importRefPtr = NULL;
+
Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &new);
if (!new) {
@@ -1484,6 +1492,18 @@ Tcl_CreateCommand(interp, cmdName, proc, clientData, deleteProc)
cmdPtr->importRefPtr = NULL;
/*
+ * Plug in any existing import references found above. Be sure
+ * to update all of these references to point to the new command.
+ */
+ cmdPtr->importRefPtr = oldRefPtr;
+ while (oldRefPtr != NULL) {
+ refCmdPtr = oldRefPtr->importedCmdPtr;
+ dataPtr = (ImportedCmdData*)refCmdPtr->objClientData;
+ dataPtr->realCmdPtr = cmdPtr;
+ oldRefPtr = oldRefPtr->nextPtr;
+ }
+
+ /*
* We just created a command, so in its namespace and all of its parent
* namespaces, it may shadow global commands with the same name. If any
* shadowed commands are found, invalidate all cached command references
@@ -1539,11 +1559,13 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
* when this command is deleted. */
{
Interp *iPtr = (Interp *) interp;
+ ImportRef *oldRefPtr = NULL;
Namespace *nsPtr, *dummy1, *dummy2;
- Command *cmdPtr;
+ Command *cmdPtr, *refCmdPtr;
Tcl_HashEntry *hPtr;
char *tail;
int new, result;
+ ImportedCmdData *dataPtr;
if (iPtr->flags & DELETED) {
/*
@@ -1590,6 +1612,16 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
return (Tcl_Command) cmdPtr;
}
+ /*
+ * Otherwise, we delete the old command. Be careful to preserve
+ * any existing import links so we can restore them down below.
+ * That way, you can redefine a command and its import status
+ * will remain intact.
+ */
+
+ oldRefPtr = cmdPtr->importRefPtr;
+ cmdPtr->importRefPtr = NULL;
+
Tcl_DeleteCommandFromToken(interp, (Tcl_Command) cmdPtr);
hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, tail, &new);
if (!new) {
@@ -1617,7 +1649,27 @@ Tcl_CreateObjCommand(interp, cmdName, proc, clientData, deleteProc)
cmdPtr->deleteData = clientData;
cmdPtr->deleted = 0;
cmdPtr->importRefPtr = NULL;
+
+ /*
+ * Plug in any existing import references found above. Be sure
+ * to update all of these references to point to the new command.
+ */
+ cmdPtr->importRefPtr = oldRefPtr;
+ while (oldRefPtr != NULL) {
+ refCmdPtr = oldRefPtr->importedCmdPtr;
+ dataPtr = (ImportedCmdData*)refCmdPtr->objClientData;
+ dataPtr->realCmdPtr = cmdPtr;
+ oldRefPtr = oldRefPtr->nextPtr;
+ }
+ /*
+ * We just created a command, so in its namespace and all of its parent
+ * namespaces, it may shadow global commands with the same name. If any
+ * shadowed commands are found, invalidate all cached command references
+ * in the affected namespaces.
+ */
+
+ TclResetShadowedCmdRefs(interp, cmdPtr);
return (Tcl_Command) cmdPtr;
}