[Tcl-bugs] [ tcl-Bugs-1203787 ] NaN's escape detection in expressions

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Bugs item #1203787, was opened at 2005-05-17 14:13
Message generated for change (Comment added) made by dgp
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Category: 46. Bytecode Compiler
Group: obsolete: 8.4.9
Status: Open
Resolution: None
Priority: 5
Submitted By: Don Porter (dgp)
Assigned to: miguel sofer (msofer)
Summary: NaN's escape detection in expressions

Initial Comment:

% binary scan [binary format d NaN] d d
1
% expr {$d}
domain error: argument not in valid range

Good.  But...

% expr {$d && $d}
1

Problem is that TEBC directly pokes
into the objPtr->typePtr of values and
accepts anything of tclDoubleType as
a valid double.  A call to Tcl_GetDoubleFromObj
would include the NaN check.



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>Comment By: Don Porter (dgp)
Date: 2005-08-26 16:15

Message:
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user_id=80530


The #undef ACCEPT_NAN 
configuration on numerics branch
has one fix:

% binary scan [binary format d NaN] d d
1
% expr {$d}
domain error: argument not in valid range
% expr {$d && $d}
floating point value is Not a Number


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