gawk: Miscellaneous Debugger Commands
14.3.6 Miscellaneous Commands
-----------------------------
There are a few more commands that do not fit into the previous
categories, as follows:
'dump' [FILENAME]
Dump byte code of the program to standard output or to the file
named in FILENAME. This prints a representation of the internal
instructions that 'gawk' executes to implement the 'awk' commands
in a program. This can be very enlightening, as the following
Program::) demonstrates:
gawk> dump
-| # BEGIN
-|
-| [ 1:0xfcd340] Op_rule : [in_rule = BEGIN] [source_file = brini.awk]
-| [ 1:0xfcc240] Op_push_i : "~" [MALLOC|STRING|STRCUR]
-| [ 1:0xfcc2a0] Op_push_i : "~" [MALLOC|STRING|STRCUR]
-| [ 1:0xfcc280] Op_match :
-| [ 1:0xfcc1e0] Op_store_var : O
-| [ 1:0xfcc2e0] Op_push_i : "==" [MALLOC|STRING|STRCUR]
-| [ 1:0xfcc340] Op_push_i : "==" [MALLOC|STRING|STRCUR]
-| [ 1:0xfcc320] Op_equal :
-| [ 1:0xfcc200] Op_store_var : o
-| [ 1:0xfcc380] Op_push : o
-| [ 1:0xfcc360] Op_plus_i : 0 [MALLOC|NUMCUR|NUMBER]
-| [ 1:0xfcc220] Op_push_lhs : o [do_reference = true]
-| [ 1:0xfcc300] Op_assign_plus :
-| [ :0xfcc2c0] Op_pop :
-| [ 1:0xfcc400] Op_push : O
-| [ 1:0xfcc420] Op_push_i : "" [MALLOC|STRING|STRCUR]
-| [ :0xfcc4a0] Op_no_op :
-| [ 1:0xfcc480] Op_push : O
-| [ :0xfcc4c0] Op_concat : [expr_count = 3] [concat_flag = 0]
-| [ 1:0xfcc3c0] Op_store_var : x
-| [ 1:0xfcc440] Op_push_lhs : X [do_reference = true]
-| [ 1:0xfcc3a0] Op_postincrement :
-| [ 1:0xfcc4e0] Op_push : x
-| [ 1:0xfcc540] Op_push : o
-| [ 1:0xfcc500] Op_plus :
-| [ 1:0xfcc580] Op_push : o
-| [ 1:0xfcc560] Op_plus :
-| [ 1:0xfcc460] Op_leq :
-| [ :0xfcc5c0] Op_jmp_false : [target_jmp = 0xfcc5e0]
-| [ 1:0xfcc600] Op_push_i : "%c" [MALLOC|STRING|STRCUR]
-| [ :0xfcc660] Op_no_op :
-| [ 1:0xfcc520] Op_assign_concat : c
-| [ :0xfcc620] Op_jmp : [target_jmp = 0xfcc440]
...
-| [ 2:0xfcc5a0] Op_K_printf : [expr_count = 17] [redir_type = ""]
-| [ :0xfcc140] Op_no_op :
-| [ :0xfcc1c0] Op_atexit :
-| [ :0xfcc640] Op_stop :
-| [ :0xfcc180] Op_no_op :
-| [ :0xfcd150] Op_after_beginfile :
-| [ :0xfcc160] Op_no_op :
-| [ :0xfcc1a0] Op_after_endfile :
gawk>
'exit'
Exit the debugger. See the entry for 'quit', later in this list.
'help'
'h'
Print a list of all of the 'gawk' debugger commands with a short
summary of their usage. 'help COMMAND' prints the information
about the command COMMAND.
'list' ['-' | '+' | N | FILENAME':'N | N-M | FUNCTION]
'l' ['-' | '+' | N | FILENAME':'N | N-M | FUNCTION]
Print the specified lines (default 15) from the current source file
or the file named FILENAME. The possible arguments to 'list' are
as follows:
'-' (Minus)
Print lines before the lines last printed.
'+'
Print lines after the lines last printed. 'list' without any
argument does the same thing.
N
Print lines centered around line number N.
N-M
Print lines from N to M.
FILENAME':'N
Print lines centered around line number N in source file
FILENAME. This command may change the current source file.
FUNCTION
Print lines centered around the beginning of the function
FUNCTION. This command may change the current source file.
'quit'
'q'
Exit the debugger. Debugging is great fun, but sometimes we all
have to tend to other obligations in life, and sometimes we find
the bug and are free to go on to the next one! As we saw earlier,
if you are running a program, the debugger warns you when you type
'q' or 'quit', to make sure you really want to quit.
'trace' ['on' | 'off']
Turn on or off continuous printing of the instructions that are
about to be executed, along with the 'awk' lines they implement.
The default is 'off'.
It is to be hoped that most of the "opcodes" in these instructions
are fairly self-explanatory, and using 'stepi' and 'nexti' while
'trace' is on will make them into familiar friends.
Info Catalog
gawk: Debugger Info
gawk: List of Debugger Commands