RE: [Patch 1830184] TclResetResult

	THIS PATCH WAS REVERTED: initial (mis)measurements overstated the
	perfomance wins, which turn out to be tiny. Not worth the
	complication.

8 files changed, 37 insertions, 81 deletions

diff --git a/ChangeLog b/ChangeLog
index 674669c..4431805 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -16,6 +16,9 @@
 	* generic/tclStubLib.c:   [Patch 1830184]
 	* generic/tclUtil.c:
 
+	THIS PATCH WAS REVERTED: initial (mis)measurements overstated the
+	perfomance wins, which turn out to be tiny. Not worth the
+	complication. 
 	
 2007-11-11  Jeff Hobbs  <jeffh@ActiveState.com>
 
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index 5b38f5f..09eecc1 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -14,7 +14,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclBasic.c,v 1.280 2007/11/12 03:38:13 msofer Exp $
+ * RCS: @(#) $Id: tclBasic.c,v 1.281 2007/11/12 22:12:05 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -3426,7 +3426,7 @@ TclInterpReady(
      * any previous error information.
      */
 
-    TclResetResult(iPtr);
+    Tcl_ResetResult(interp);
 
     /*
      * If the interpreter has been deleted, return an error.
@@ -5398,7 +5398,6 @@ Tcl_AddObjErrorInfo(
 	}
 	Tcl_AppendToObj(iPtr->errorInfo, message, length);
     }
-    ((Interp *) interp)->flags |= INTERP_RESULT_UNCLEAN;    
 }
 
 /*
diff --git a/generic/tclExecute.c b/generic/tclExecute.c
index db7a504..44cb8e8 100644
--- a/generic/tclExecute.c
+++ b/generic/tclExecute.c
@@ -13,7 +13,7 @@
  * 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 1.347 2007/11/12 03:38:13 msofer Exp $
+ * RCS: @(#) $Id: tclExecute.c,v 1.348 2007/11/12 22:12:06 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -1218,7 +1218,7 @@ Tcl_ExprObj(
 
     saveObjPtr = Tcl_GetObjResult(interp);
     Tcl_IncrRefCount(saveObjPtr);
-    TclResetResult(interp);
+    Tcl_ResetResult(interp);
 
     /*
      * Increment the code's ref count while it is being executed. If
@@ -6336,7 +6336,7 @@ TclExecuteByteCode(
 
     case INST_END_CATCH:
 	catchTop--;
-	TclResetResult(interp);
+	Tcl_ResetResult(interp);
 	result = TCL_OK;
 	TRACE(("=> catchTop=%d\n", (catchTop - initCatchTop - 1)));
 	NEXT_INST_F(1, 0, 0);
diff --git a/generic/tclInt.h b/generic/tclInt.h
index 57033fa..2874a74 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -13,7 +13,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclInt.h,v 1.343 2007/11/12 03:38:13 msofer Exp $
+ * RCS: @(#) $Id: tclInt.h,v 1.344 2007/11/12 22:12:07 msofer Exp $
  */
 
 #ifndef _TCLINT
@@ -1973,39 +1973,6 @@ typedef struct InterpList {
 #define INTERP_TRACE_IN_PROGRESS	0x200
 #define INTERP_ALTERNATE_WRONG_ARGS	0x400
 #define ERR_LEGACY_COPY			0x800
-#define INTERP_RESULT_UNCLEAN           0x1000
-
-/*
- * The following macro resets the interp's obj result and returns 1 if a call
- * to the full Tcl_ResetResult is needed. TclResetResult macro uses it.
- */
-
-#define ResetObjResultM(iPtr) \
-    {								\
-	register Tcl_Obj *objResultPtr = (iPtr)->objResultPtr;	\
-	\
-	if (Tcl_IsShared(objResultPtr)) {\
-	    TclDecrRefCount(objResultPtr);\
-	    TclNewObj(objResultPtr);\
-	    Tcl_IncrRefCount(objResultPtr);\
-	    (iPtr)->objResultPtr = objResultPtr;		\
-	} else if (objResultPtr->bytes != tclEmptyStringRep) {	\
-	    if (objResultPtr->bytes != NULL) {\
-		ckfree((char *) objResultPtr->bytes);	\
-	    }\
-	    objResultPtr->bytes = tclEmptyStringRep;\
-	    objResultPtr->length = 0;\
-	    TclFreeIntRep(objResultPtr);\
-	    objResultPtr->typePtr = NULL;\
-	}\
-    } 
-
-#define TclResetResult(iPtr)			\
-    {\
-	ResetObjResultM((Interp *)(iPtr));		\
-	if (((Interp *)(iPtr))->flags & INTERP_RESULT_UNCLEAN)	\
-	    TclCleanResult((Interp *)(iPtr));			\
-    }\
 
 /*
  * Maximum number of levels of nesting permitted in Tcl commands (used to
@@ -2449,7 +2416,6 @@ MODULE_SCOPE int	TclChanCaughtErrorBypass(Tcl_Interp *interp,
 			    Tcl_Channel chan);
 MODULE_SCOPE void	TclCleanupLiteralTable(Tcl_Interp *interp,
 			    LiteralTable *tablePtr);
-MODULE_SCOPE void       TclCleanResult(Interp *iPtr);
 MODULE_SCOPE int	TclDoubleDigits(char *buf, double value, int *signum);
 MODULE_SCOPE void       TclDeleteNamespaceVars(Namespace *nsPtr);
 /* TIP #280 - Modified token based evulation, with line information */
diff --git a/generic/tclProc.c b/generic/tclProc.c
index 22333dd..c7d7004 100644
--- a/generic/tclProc.c
+++ b/generic/tclProc.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: tclProc.c,v 1.137 2007/11/12 03:38:14 msofer Exp $
+ * RCS: @(#) $Id: tclProc.c,v 1.138 2007/11/12 22:12:07 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -2218,7 +2218,6 @@ TclUpdateReturnInfo(
 	    iPtr->flags |= ERR_LEGACY_COPY;
 	}
     }
-    iPtr->flags |= INTERP_RESULT_UNCLEAN;
     return code;
 }
 
diff --git a/generic/tclResult.c b/generic/tclResult.c
index 6f92950..3db3f17 100644
--- a/generic/tclResult.c
+++ b/generic/tclResult.c
@@ -8,7 +8,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclResult.c,v 1.43 2007/11/12 03:38:14 msofer Exp $
+ * RCS: @(#) $Id: tclResult.c,v 1.44 2007/11/12 22:12:07 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -336,7 +336,6 @@ Tcl_RestoreResult(
 
     Tcl_DecrRefCount(iPtr->objResultPtr);
     iPtr->objResultPtr = statePtr->objResultPtr;
-    iPtr->flags |= INTERP_RESULT_UNCLEAN;
 }
 
 /*
@@ -444,7 +443,6 @@ Tcl_SetResult(
      */
 
     ResetObjResult(iPtr);
-    iPtr->flags |= INTERP_RESULT_UNCLEAN;
 }
 
 /*
@@ -477,7 +475,6 @@ Tcl_GetStringResult(
 	Tcl_SetResult(interp, TclGetString(Tcl_GetObjResult(interp)),
 		TCL_VOLATILE);
     }
-    ((Interp *)interp)->flags |= INTERP_RESULT_UNCLEAN;
     return interp->result;
 }
 
@@ -587,7 +584,6 @@ Tcl_GetObjResult(
 	}
 	iPtr->result = iPtr->resultSpace;
 	iPtr->resultSpace[0] = 0;
-	iPtr->flags &= ~INTERP_RESULT_UNCLEAN;	
     }
     return iPtr->objResultPtr;
 }
@@ -830,7 +826,6 @@ SetupAppendBuffer(
 
     Tcl_FreeResult((Tcl_Interp *) iPtr);
     iPtr->result = iPtr->appendResult;
-    iPtr->flags |= INTERP_RESULT_UNCLEAN;    
 }
 
 /*
@@ -871,7 +866,6 @@ Tcl_FreeResult(
     }
 
     ResetObjResult(iPtr);
-    iPtr->flags &= ~INTERP_RESULT_UNCLEAN;    
 }
 
 /*
@@ -897,17 +891,9 @@ void
 Tcl_ResetResult(
     register Tcl_Interp *interp)/* Interpreter for which to clear result. */
 {
-    /*
-     * This function is defined in a macro in tclInt.h
-     */
-
-    TclResetResult((Interp *) interp);
-}
+    register Interp *iPtr = (Interp *) interp;
 
-void
-TclCleanResult(
-    Interp *iPtr)
-{
+    ResetObjResult(iPtr);
     if (iPtr->freeProc != NULL) {
 	if (iPtr->freeProc == TCL_DYNAMIC) {
 	    ckfree(iPtr->result);
@@ -921,8 +907,8 @@ TclCleanResult(
     if (iPtr->errorCode) {
 	/* Legacy support */
 	if (iPtr->flags & ERR_LEGACY_COPY) {
-	    Tcl_ObjSetVar2((Tcl_Interp *)iPtr, iPtr->ecVar,
-		    NULL, iPtr->errorCode, TCL_GLOBAL_ONLY);
+	    Tcl_ObjSetVar2(interp, iPtr->ecVar, NULL,
+		    iPtr->errorCode, TCL_GLOBAL_ONLY);
 	}
 	Tcl_DecrRefCount(iPtr->errorCode);
 	iPtr->errorCode = NULL;
@@ -930,8 +916,8 @@ TclCleanResult(
     if (iPtr->errorInfo) {
 	/* Legacy support */
 	if (iPtr->flags & ERR_LEGACY_COPY) {
-	    Tcl_ObjSetVar2((Tcl_Interp *) iPtr, iPtr->eiVar,
-		    NULL, iPtr->errorInfo, TCL_GLOBAL_ONLY);
+	    Tcl_ObjSetVar2(interp, iPtr->eiVar, NULL,
+		    iPtr->errorInfo, TCL_GLOBAL_ONLY);
 	}
 	Tcl_DecrRefCount(iPtr->errorInfo);
 	iPtr->errorInfo = NULL;
@@ -942,7 +928,7 @@ TclCleanResult(
 	Tcl_DecrRefCount(iPtr->returnOpts);
 	iPtr->returnOpts = NULL;
     }
-    iPtr->flags &= ~(ERR_ALREADY_LOGGED | ERR_LEGACY_COPY | INTERP_RESULT_UNCLEAN);
+    iPtr->flags &= ~(ERR_ALREADY_LOGGED | ERR_LEGACY_COPY);
 }
 
 /*
@@ -968,11 +954,22 @@ ResetObjResult(
     register Interp *iPtr)	/* Points to the interpreter whose result
 				 * object should be reset. */
 {
-    /*
-     * This function is defined in a macro in tclInt.h
-     */
-    
-    ResetObjResultM(iPtr);
+    register Tcl_Obj *objResultPtr = iPtr->objResultPtr;
+
+    if (Tcl_IsShared(objResultPtr)) {
+	TclDecrRefCount(objResultPtr);
+	TclNewObj(objResultPtr);
+	Tcl_IncrRefCount(objResultPtr);
+	iPtr->objResultPtr = objResultPtr;
+    } else if (objResultPtr->bytes != tclEmptyStringRep) {
+	if (objResultPtr->bytes != NULL) {
+	    ckfree((char *) objResultPtr->bytes);
+	}
+	objResultPtr->bytes = tclEmptyStringRep;
+	objResultPtr->length = 0;
+	TclFreeIntRep(objResultPtr);
+	objResultPtr->typePtr = NULL;
+    }
 }
 
 /*
@@ -1081,7 +1078,6 @@ Tcl_SetObjErrorCode(
     }
     iPtr->errorCode = errorObjPtr;
     Tcl_IncrRefCount(iPtr->errorCode);
-    iPtr->flags |= INTERP_RESULT_UNCLEAN;
 }
 
 /*
@@ -1209,7 +1205,6 @@ TclProcessReturn(
 	}
 	iPtr->returnOpts = returnOpts;
 	Tcl_IncrRefCount(iPtr->returnOpts);
-	iPtr->flags |= INTERP_RESULT_UNCLEAN;	
     }
 
     if (code == TCL_ERROR) {
@@ -1239,16 +1234,14 @@ TclProcessReturn(
 	if (valuePtr != NULL) {
 	    TclGetIntFromObj(NULL, valuePtr, &iPtr->errorLine);
 	}
-	iPtr->flags |= INTERP_RESULT_UNCLEAN;	
     }
     if (level != 0) {
 	iPtr->returnLevel = level;
 	iPtr->returnCode = code;
-	iPtr->flags |= INTERP_RESULT_UNCLEAN;	
 	return TCL_RETURN;
     }
     if (code == TCL_ERROR) {
-	iPtr->flags |= (ERR_LEGACY_COPY | INTERP_RESULT_UNCLEAN);
+	iPtr->flags |= ERR_LEGACY_COPY;
     }
     return code;
 }
@@ -1409,7 +1402,6 @@ TclMergeReturnOptions(
     } else {
 	*optionsPtrPtr = returnOpts;
     }
-    ((Interp *)interp)->flags |= INTERP_RESULT_UNCLEAN;
     return TCL_OK;
 
   error:
@@ -1516,7 +1508,6 @@ Tcl_SetReturnOptions(
     }
 
     Tcl_DecrRefCount(options);
-    ((Interp *)interp)->flags |= INTERP_RESULT_UNCLEAN;
     return code;
 }
 
diff --git a/generic/tclStubLib.c b/generic/tclStubLib.c
index 0ee0d4a..1d65bc8 100644
--- a/generic/tclStubLib.c
+++ b/generic/tclStubLib.c
@@ -10,7 +10,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclStubLib.c,v 1.19 2007/11/12 03:38:14 msofer Exp $
+ * RCS: @(#) $Id: tclStubLib.c,v 1.20 2007/11/12 22:12:07 msofer Exp $
  */
 
 /*
@@ -50,7 +50,6 @@ HasStubSupport(
     interp->result =
 	    "This interpreter does not support stubs-enabled extensions.";
     interp->freeProc = TCL_STATIC;
-    ((Interp *)interp)->flags |= INTERP_RESULT_UNCLEAN;
     return NULL;
 }
 
diff --git a/generic/tclUtil.c b/generic/tclUtil.c
index 76dfd12..5a6004c 100644
--- a/generic/tclUtil.c
+++ b/generic/tclUtil.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.
  *
- * RCS: @(#) $Id: tclUtil.c,v 1.90 2007/11/12 22:01:42 hobbs Exp $
+ * RCS: @(#) $Id: tclUtil.c,v 1.91 2007/11/12 22:12:08 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -2024,7 +2024,6 @@ Tcl_DStringResult(
     } else {
 	Tcl_SetResult(interp, dsPtr->string, TCL_VOLATILE);
     }
-    ((Interp *) interp)->flags |= INTERP_RESULT_UNCLEAN;
 
     dsPtr->string = dsPtr->staticSpace;
     dsPtr->length = 0;