tcl_traceExec
, a
built-in Tcl variable, controls how much tracing information is displayed during bytecode execution.
See Also edit
- bytecode
Description edit
By default, the value of
$tcl_traceExec is
0, and no information is displayed. Setting
$tcl_traceExec to
1 generates a one-line trace in stdout on each call to a Tcl procedure. Setting it to
2 generates a line of output whenever any Tcl command is invoked that contains the name of the command and its arguments. Setting it to 3 produces a detailed trace showing the result of executing each bytecode instruction. Note that when
$tcl_traceExec is
2 or
3, commands such as
set and
incr that have been entirely replaced by a sequence of bytecode instructions are not shown. Setting this variable is useful in tracking down suspected problems with the bytecode compiler and interpreter.
$tcl_traceExec and its functionality only exist if
TCL_COMPILE_DEBUG was defined when Tcl was compiled. This is usually done by passing
--enable-symbols=compile to
configure during the build of Tcl.
• Edit