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author | jan.nijtmans <nijtmans@users.sourceforge.net> | 2012-12-13 11:02:15 (GMT) |
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committer | jan.nijtmans <nijtmans@users.sourceforge.net> | 2012-12-13 11:02:15 (GMT) |
commit | eace9319cbc98014c7487b7582f750ff693c0570 (patch) | |
tree | e4d00861fe1bf524826adc3c3653eccbc77dac74 /generic | |
parent | c13ee047c8e204b46ca84bf7c9737f464470782f (diff) | |
parent | eb7f17ba98bd89105f743da8af3037728027b4de (diff) | |
download | tcl-eace9319cbc98014c7487b7582f750ff693c0570.zip tcl-eace9319cbc98014c7487b7582f750ff693c0570.tar.gz tcl-eace9319cbc98014c7487b7582f750ff693c0570.tar.bz2 |
Fix Tcl_DecrRefCount macro, not to refer to its objPtr parameter twice.
Diffstat (limited to 'generic')
-rw-r--r-- | generic/tcl.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/generic/tcl.h b/generic/tcl.h index 147672c..5a85c33 100644 --- a/generic/tcl.h +++ b/generic/tcl.h @@ -854,10 +854,7 @@ typedef struct Tcl_Obj { * whether an object is shared (i.e. has reference count > 1). Note: clients * should use Tcl_DecrRefCount() when they are finished using an object, and * should never call TclFreeObj() directly. TclFreeObj() is only defined and - * made public in tcl.h to support Tcl_DecrRefCount's macro definition. Note - * also that Tcl_DecrRefCount() refers to the parameter "obj" twice. This - * means that you should avoid calling it with an expression that is expensive - * to compute or has side effects. + * made public in tcl.h to support Tcl_DecrRefCount's macro definition. */ void Tcl_IncrRefCount(Tcl_Obj *objPtr); @@ -2504,7 +2501,12 @@ EXTERN void Tcl_GetMemoryInfo(Tcl_DString *dsPtr); * http://c2.com/cgi/wiki?TrivialDoWhileLoop */ # define Tcl_DecrRefCount(objPtr) \ - do { if (--(objPtr)->refCount <= 0) TclFreeObj(objPtr); } while(0) + do { \ + Tcl_Obj *obj = (objPtr); \ + if ((obj)->refCount-- < 2) { \ + TclFreeObj(obj); \ + } \ + } while(0) # define Tcl_IsShared(objPtr) \ ((objPtr)->refCount > 1) #endif |