gawk: Execution Stack
14.3.4 Working with the Stack
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Whenever you run a program that contains any function calls, 'gawk'
maintains a stack of all of the function calls leading up to where the
program is right now. You can see how you got to where you are, and
also move around in the stack to see what the state of things was in the
functions that called the one you are in. The commands for doing this
are:
'backtrace' [COUNT]
'bt' [COUNT]
'where' [COUNT]
Print a backtrace of all function calls (stack frames), or
innermost COUNT frames if COUNT > 0. Print the outermost COUNT
frames if COUNT < 0. The backtrace displays the name and arguments
to each function, the source file name, and the line number. The
alias 'where' for 'backtrace' is provided for longtime GDB users
who may be used to that command.
'down' [COUNT]
Move COUNT (default 1) frames down the stack toward the innermost
frame. Then select and print the frame.
'frame' [N]
'f' [N]
Select and print stack frame N. Frame 0 is the currently
executing, or "innermost", frame (function call); frame 1 is the
frame that called the innermost one. The highest-numbered frame is
the one for the main program. The printed information consists of
the frame number, function and argument names, source file, and the
source line.
'up' [COUNT]
Move COUNT (default 1) frames up the stack toward the outermost
frame. Then select and print the frame.
Info Catalog
gawk: Viewing And Changing Data
gawk: List of Debugger Commands
gawk: Debugger Info