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authorMiguel Sofer <miguel.sofer@gmail.com>2004-05-22 17:01:38 (GMT)
committerMiguel Sofer <miguel.sofer@gmail.com>2004-05-22 17:01:38 (GMT)
commitaf7d844c1eb713c44d97c7715a6ba37257973592 (patch)
tree90793d56fdca8aa7d13cfe39bc1246dca118d077
parent64321856827557769e2a68ac721330f82a3c7065 (diff)
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* generic/tclVar.c (TclObjUnsetVar2): backported fix [Bug 735335]
and new (in tcl8.4) exteriorisations of [Bug 736729] due to the use of tclNsVarNameType obj types. The consequences of [Bug 736729] should be the same as in tcl8.3 and previous versions. The use of tclNsVarNameType objs is still disabled, pending a decision by the release manager.
-rw-r--r--ChangeLog9
-rw-r--r--generic/tclVar.c35
2 files changed, 35 insertions, 9 deletions
diff --git a/ChangeLog b/ChangeLog
index 65cd4f4..8f296f2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2004-05-22 Miguel Sofer <msofer@users.sf.net>
+
+ * generic/tclVar.c (TclObjUnsetVar2): backported fix [Bug 735335]
+ and new (in tcl8.4) exteriorisations of [Bug 736729] due to the use of
+ tclNsVarNameType obj types. The consequences of [Bug 736729]
+ should be the same as in tcl8.3 and previous versions.
+ The use of tclNsVarNameType objs is still disabled, pending a
+ decision by the release manager.
+
2004-05-19 Donal K. Fellows <donal.k.fellows@man.ac.uk>
* win/tclWinFile.c (TclpMatchInDirectory): fix for an issue
diff --git a/generic/tclVar.c b/generic/tclVar.c
index 80089b6..e6bff11 100644
--- a/generic/tclVar.c
+++ b/generic/tclVar.c
@@ -15,7 +15,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclVar.c,v 1.69.2.4 2003/11/20 19:19:03 msofer Exp $
+ * RCS: @(#) $Id: tclVar.c,v 1.69.2.5 2004/05/22 17:01:39 msofer Exp $
*/
#include "tclInt.h"
@@ -555,14 +555,14 @@ TclObjLookupVar(interp, part1Ptr, part2, flags, msg, createPart1, createPart2,
/*
* TEMPORARYLY DISABLED tclNsVarNameType
*
- * This is a stop-gap fix for [Bug 735335]; it may not address the
- * real issue (which I haven't pinned down yet), but it avoids the
- * segfault in the test case.
* This optimisation will hopefully be turned back on soon.
- * Miguel Sofer, 2003-05-12
+ * Miguel Sofer, 2004-05-22
*/
} else if (index > -3) {
+ /*
+ * A cacheable namespace or global variable.
+ */
Namespace *nsPtr;
nsPtr = ((index == -1)? iPtr->globalNsPtr : varFramePtr->nsPtr);
@@ -2036,6 +2036,15 @@ TclObjUnsetVar2(interp, part1Ptr, part2, flags)
varPtr->searchPtr = NULL;
/*
+ * Keep the variable alive until we're done with it. We used to
+ * increase/decrease the refCount for each operation, making it
+ * hard to find [Bug 735335] - caused by unsetting the variable
+ * whose value was the variable's name.
+ */
+
+ varPtr->refCount++;
+
+ /*
* Call trace procedures for the variable being deleted. Then delete
* its traces. Be sure to abort any other traces for the variable
* that are still pending. Special tricks:
@@ -2047,7 +2056,6 @@ TclObjUnsetVar2(interp, part1Ptr, part2, flags)
if ((dummyVar.tracePtr != NULL)
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
- varPtr->refCount++;
dummyVar.flags &= ~VAR_TRACE_ACTIVE;
CallVarTraces(iPtr, arrayPtr, &dummyVar, part1, part2,
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY))
@@ -2063,7 +2071,6 @@ TclObjUnsetVar2(interp, part1Ptr, part2, flags)
activePtr->nextTracePtr = NULL;
}
}
- varPtr->refCount--;
}
/*
@@ -2087,12 +2094,10 @@ TclObjUnsetVar2(interp, part1Ptr, part2, flags)
* array are being deleted when the array still exists, but since the
* array is about to be removed anyway, that shouldn't really matter.
*/
- varPtr->refCount++;
DeleteArray(iPtr, part1, dummyVarPtr,
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY))
| TCL_TRACE_UNSETS);
/* Decr ref count */
- varPtr->refCount--;
}
if (TclIsVarScalar(dummyVarPtr)
&& (dummyVarPtr->value.objPtr != NULL)) {
@@ -2122,11 +2127,23 @@ TclObjUnsetVar2(interp, part1Ptr, part2, flags)
}
/*
+ * Try to avoid keeping the Var struct allocated due to a tclNsVarNameType
+ * keeping a reference. This removes some additional exteriorisations of
+ * [Bug 736729], but may be a good thing independently of the bug.
+ */
+
+ if (part1Ptr->typePtr == &tclNsVarNameType) {
+ part1Ptr->typePtr->freeIntRepProc(part1Ptr);
+ part1Ptr->typePtr = NULL;
+ }
+
+ /*
* Finally, if the variable is truly not in use then free up its Var
* structure and remove it from its hash table, if any. The ref count of
* its value object, if any, was decremented above.
*/
+ varPtr->refCount--;
CleanupVar(varPtr, arrayPtr);
return result;
}