[Tcl-bugs] [ tcl-Bugs-1638414 ] {*} crashes interpreter on string that is not a valid list.

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Bugs item #1638414, was opened at 2007-01-18 10:06
Message generated for change (Settings changed) made by dkf
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https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1638414&group_id=10894

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Category: 46. Bytecode Compiler
Group: development: 8.5a6
Status: Closed
Resolution: Fixed
>Priority: 9
Private: No
Submitted By: Mark Janssen (mpc_janssen)
Assigned to: Donal K. Fellows (dkf)
Summary: {*} crashes interpreter on string that is not a valid list.

Initial Comment:
When replaying the following interactive session, the interpreter will crash on the second {*}

% set a "{foo bar"
% {*}$a
unmatched open brace in list
% {*}"{foo bar"
H:\>

Notice that {*} only crashes the interpreter when the string is put after {*} literally.

When using uplevel to do the same, the correct error is again shown, this might suggest it is TEBC related.

% uplevel 0 {{*}"\{foo bar"}
unmatched open brace in list


Tcl version info:

() 3 % info patchlevel
8.5a6
() 4 % parray tcl_platform
tcl_platform(byteOrder)   = littleEndian
tcl_platform(machine)     = intel
tcl_platform(os)          = Windows NT
tcl_platform(osVersion)   = 5.1
tcl_platform(platform)    = windows
tcl_platform(pointerSize) = 4
tcl_platform(threaded)    = 1
tcl_platform(user)        = nlv18296
tcl_platform(wordSize)    = 4

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Comment By: Donal K. Fellows (dkf)
Date: 2007-01-18 11:46

Message:
Logged In: YES 
user_id=79902
Originator: NO

This only crashes if all expansions in the command invokation were string
literals that were bad scripts, the immediate cause of the crash being a
missing INST_EXPAND_START from the bytecode stream. The real problem was a
bad assumption in TclCompileScript, which was that TclMarkList would always
succeed (obviously not a true assumption!)

All fixed.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=110894&aid=1638414&group_id=10894