improve comments on Tcl stack management

1 files changed, 12 insertions, 1 deletions

diff --git a/generic/tclExecute.c b/generic/tclExecute.c
index eb077b6..20e61ea 100644
--- a/generic/tclExecute.c
+++ b/generic/tclExecute.c
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclExecute.c,v 1.299 2007/06/19 19:50:10 msofer Exp $
+ * RCS: @(#) $Id: tclExecute.c,v 1.300 2007/06/19 20:21:43 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -786,6 +786,11 @@ StackAllocWords(
     Tcl_Interp *interp,
     int numWords)
 {
+    /*
+     * Note that GrowEvaluationStack sets a marker in the stack. This marker
+     * is read when rewinding, e.g., by TclStackFree.
+     */
+    
     Interp *iPtr = (Interp *) interp;
     ExecEnv *eePtr = iPtr->execEnvPtr;
     Tcl_Obj **resPtr = GrowEvaluationStack(eePtr, numWords, 0);
@@ -811,6 +816,12 @@ void
 TclStackFree(
     Tcl_Interp *interp)
 {
+    /*
+     * Rewind the stack to the previous marker position. The current marker,
+     * as set in the last call to GrowEvaluationStack, contains a pointer to
+     * the previous marker.
+     */ 
+    
     Interp *iPtr = (Interp *) interp;
     ExecEnv *eePtr = iPtr->execEnvPtr;
     ExecStack *esPtr = eePtr->execStackPtr;