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| author | Miguel Sofer <miguel.sofer@gmail.com> | 2003-08-05 15:59:15 (GMT) |
|---|---|---|
| committer | Miguel Sofer <miguel.sofer@gmail.com> | 2003-08-05 15:59:15 (GMT) |
| commit | d2b201f4eff207fdee59c2c28ecb0d31cb28fb43 (patch) | |
| tree | bc69650a34f645dc70ff1ef7a9aab5864ed17f76 | |
| parent | 73d0a6fc2d48ac4bea1e1ed96781bdd37c33647f (diff) | |
| download | tcl-d2b201f4eff207fdee59c2c28ecb0d31cb28fb43.zip tcl-d2b201f4eff207fdee59c2c28ecb0d31cb28fb43.tar.gz tcl-d2b201f4eff207fdee59c2c28ecb0d31cb28fb43.tar.bz2 | |
* generic/tclexecute.c (INST_INVOKE, INST_EVAL, INST_PUSH_RESULT):
added a Tcl_ResetResult(interp) at each point where the interp's
result is pushed onto the stack, to avoid keeping an extra
reference that may cause costly Tcl_Obj duplication [Bug 781585]
Detected by Franco Violi, analyzed by Peter Spjuth and Donal
Fellows.
| -rw-r--r-- | ChangeLog | 9 | ||||
| -rw-r--r-- | generic/tclExecute.c | 34 |
2 files changed, 39 insertions, 4 deletions
@@ -1,3 +1,12 @@ +2003-08-05 Miguel Sofer <msofer@users.sf.net> + + * generic/tclexecute.c (INST_INVOKE, INST_EVAL, INST_PUSH_RESULT): + added a Tcl_ResetResult(interp) at each point where the interp's + result is pushed onto the stack, to avoid keeping an extra + reference that may cause costly Tcl_Obj duplication [Bug 781585] + Detected by Franco Violi, analyzed by Peter Spjuth and Donal + Fellows. + 2003-07-28 Vince Darley <vincentdarley@users.sourceforge.net> * doc/FileSystem.3: diff --git a/generic/tclExecute.c b/generic/tclExecute.c index 06cd7fa..fcf2dae 100644 --- a/generic/tclExecute.c +++ b/generic/tclExecute.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: tclExecute.c,v 1.104 2003/06/27 21:33:05 dgp Exp $ + * RCS: @(#) $Id: tclExecute.c,v 1.105 2003/08/05 15:59:15 msofer Exp $ */ #include "tclInt.h" @@ -1428,7 +1428,16 @@ TclExecuteByteCode(interp, codePtr) objc, cmdNameBuf), Tcl_GetObjResult(interp)); objResultPtr = Tcl_GetObjResult(interp); - NEXT_INST_V(pcAdjustment, opnd, 1); + + /* + * Reset the interp's result to avoid possible duplications + * of large objects [Bug 781585]; be careful to increase its + * refCount before resetting the result. + */ + + Tcl_IncrRefCount(objResultPtr); + Tcl_ResetResult(interp); + NEXT_INST_V(pcAdjustment, opnd, -1); } else { cleanup = opnd; goto processExceptionReturn; @@ -1454,7 +1463,16 @@ TclExecuteByteCode(interp, codePtr) objResultPtr = Tcl_GetObjResult(interp); TRACE_WITH_OBJ(("\"%.30s\" => ", O2S(objPtr)), Tcl_GetObjResult(interp)); - NEXT_INST_F(1, 1, 1); + + /* + * Reset the interp's result to avoid possible duplications + * of large objects [Bug 781585]; be careful to increase its + * refCount before resetting the result. + */ + + Tcl_IncrRefCount(objResultPtr); + Tcl_ResetResult(interp); + NEXT_INST_F(1, 1, -1); } else { cleanup = 1; goto processExceptionReturn; @@ -3995,7 +4013,15 @@ TclExecuteByteCode(interp, codePtr) case INST_PUSH_RESULT: objResultPtr = Tcl_GetObjResult(interp); TRACE_WITH_OBJ(("=> "), Tcl_GetObjResult(interp)); - NEXT_INST_F(1, 0, 1); + /* + * Reset the interp's result to avoid possible duplications + * of large objects [Bug 781585]; be careful to increase its + * refCount before resetting the result. + */ + + Tcl_IncrRefCount(objResultPtr); + Tcl_ResetResult(interp); + NEXT_INST_F(1, 0, -1); case INST_PUSH_RETURN_CODE: objResultPtr = Tcl_NewLongObj(result); |