idlwave: Walking the Calling Stack
5.4.5 Walking the Calling Stack
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While debugging a program, it can be very useful to check the context in
which the current routine was called, for instance to help understand
the value of the arguments passed. To do so conveniently you need to
examine the calling stack. If execution is stopped somewhere deep in a
program, you can use the commands ‘C-c C-d C-<UP>’
(‘idlwave-shell-stack-up’) and ‘C-c C-d C-<DOWN>’
(‘idlwave-shell-stack-down’), or the corresponding toolbar buttons, to
move up or down through the calling stack. The mode line of the shell
window will indicate the position within the stack with a label like
‘[-3:MYPRO]’. The line of IDL code at that stack position will be
highlighted. If you continue execution, IDLWAVE will automatically
return to the current level. 
Examining Variables, for
information how to examine the value of variables and expressions on
higher calling stack levels.
Info Catalog
idlwave: Compiling Programs
idlwave: Debugging IDL Programs
idlwave: Electric Debug Mode