Fix [d4e7780ca1681cd095dbd81fe264feff75c988f7|d4e7780ca1]: "global" cmd literal sharing vs. per-interp resolvers

1 files changed, 71 insertions, 12 deletions

diff --git a/generic/tclTest.c b/generic/tclTest.c
index e0ed374..47d85e1 100644
--- a/generic/tclTest.c
+++ b/generic/tclTest.c
@@ -7326,24 +7326,83 @@ InterpCmdResolver(
     CallFrame *varFramePtr = iPtr->varFramePtr;
     Proc *procPtr = (varFramePtr->isProcCallFrame & FRAME_IS_PROC) ?
             varFramePtr->procPtr : NULL;
-    Namespace *ns2NsPtr = (Namespace *)
-            Tcl_FindNamespace(interp, "::ns2", NULL, 0);
+    Namespace *callerNsPtr = varFramePtr->nsPtr;
+    Tcl_Command resolvedCmdPtr = NULL;
 
-    if (procPtr && (procPtr->cmdPtr->nsPtr == iPtr->globalNsPtr
-            || (ns2NsPtr && procPtr->cmdPtr->nsPtr == ns2NsPtr))) {
-        const char *callingCmdName =
+    /*
+     * Just do something special on a cmd literal "z" in two cases:
+     *  A)  when the caller is a proc "x", and the proc is either in "::" or in "::ns2".
+     *  B) the caller's namespace is "ctx1" or "ctx2"
+     */
+    if ( (name[0] == 'z') && (name[1] == '\0') ) {
+        Namespace *ns2NsPtr = (Namespace *) Tcl_FindNamespace(interp, "::ns2", NULL, 0);
+
+        if (procPtr != NULL
+            && ((procPtr->cmdPtr->nsPtr == iPtr->globalNsPtr)
+                || (ns2NsPtr != NULL && procPtr->cmdPtr->nsPtr == ns2NsPtr)
+                )
+            ) {
+            /*
+             * Case A)
+             *
+             *    - The context, in which this resolver becomes active, is
+             *      determined by the name of the caller proc, which has to be
+             *      named "x".
+             *
+             *    - To determine the name of the caller proc, the proc is taken
+             *      from the topmost stack frame.
+             *
+             *    - Note that the context is NOT provided during byte-code
+             *      compilation (e.g. in TclProcCompileProc)
+             *
+             *   When these conditions hold, this function resolves the
+             *   passed-in cmd literal into a cmd "y", which is taken from the
+             *   the global namespace (for simplicity).
+             */
+
+            const char *callingCmdName =
                 Tcl_GetCommandName(interp, (Tcl_Command) procPtr->cmdPtr);
 
-        if ((callingCmdName[0] == 'x') && (callingCmdName[1] == '\0')
-                && (name[0] == 'z') && (name[1] == '\0')) {
-            Tcl_Command sourceCmdPtr = Tcl_FindCommand(interp, "y", NULL,
-                    TCL_GLOBAL_ONLY);
+            if ( callingCmdName[0] == 'x' && callingCmdName[1] == '\0' ) {
+                resolvedCmdPtr = Tcl_FindCommand(interp, "y", NULL, TCL_GLOBAL_ONLY);
+            }
+        } else if (callerNsPtr != NULL) {
+            /*
+             * Case B)
+             *
+             *    - The context, in which this resolver becomes active, is
+             *      determined by the name of the parent namespace, which has
+             *      to be named "ctx1" or "ctx2".
+             *
+             *    - To determine the name of the parent namesace, it is taken
+             *      from the 2nd highest stack frame.
+             *
+             *    - Note that the context can be provided during byte-code
+             *      compilation (e.g. in TclProcCompileProc)
+             *
+             *   When these conditions hold, this function resolves the
+             *   passed-in cmd literal into a cmd "y" or "Y" depending on the
+             *   context. The resolved procs are taken from the the global
+             *   namespace (for simplicity).
+             */
+
+            CallFrame *parentFramePtr = varFramePtr->callerPtr;
+            char *context = parentFramePtr != NULL ? parentFramePtr->nsPtr->name : "(NULL)";
 
-            if (sourceCmdPtr != NULL) {
-                *rPtr = sourceCmdPtr;
-                return TCL_OK;
+            if (strcmp(context, "ctx1") == 0 && (name[0] == 'z') && (name[1] == '\0')) {
+                resolvedCmdPtr = Tcl_FindCommand(interp, "y", NULL, TCL_GLOBAL_ONLY);
+                /* fprintf(stderr, "... y ==> %p\n", resolvedCmdPtr);*/
+
+            } else if (strcmp(context, "ctx2") == 0 && (name[0] == 'z') && (name[1] == '\0')) {
+                resolvedCmdPtr = Tcl_FindCommand(interp, "Y", NULL, TCL_GLOBAL_ONLY);
+                /*fprintf(stderr, "... Y ==> %p\n", resolvedCmdPtr);*/
             }
         }
+
+        if (resolvedCmdPtr != NULL) {
+            *rPtr = resolvedCmdPtr;
+            return TCL_OK;
+        }
     }
     return TCL_CONTINUE;
 }