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.TH SDB 1
.CT 1 debug_tune
.SH NAME
sdb \- symbolic debugger
.SH SYNOPSIS
.B sdb
[
.I objfil
[
.I corfil
[
.I directory
]
]
]
.SH DESCRIPTION
.I Sdb
is a symbolic debugger.
It may examine source files, object files, and running or stopped
core images.
.PP
.I Objfil
is an executable program (default
.BR a.out )
compiled with option
.B -g
of
.I cc
or
.IR f77 (1).
.I Corfil
is a core image (default
.BR core )
resulting from the execution of
.I objfil .
.I Directory
is the home of source files,
.L .
by default.
.PP
.I Sdb
maintains a `current line' and a `current file', initially
the line number and source file name where 
.I corfil
stopped executing, or the first line in function
.LR main
if there is no core image.
.PP
Variables are referred to by name, by structure or array
reference, or by a combination thereof.
Variables not in scope at the current line
are referred to as
.IB procedure : variable
.RI ( procedure
may be a Fortran common block).
In the syntax below, a `variable' may also be an integer constant
designating a storage location, or a variable plus a constant
designating a storage offset.
.PP
Line numbers in the source program are referred to as
.IB filename : number,
.IB procedure : number, 
or
.I number
(in the current file).
The number is always relative to the beginning of the file.
A missing number is taken as
the first line of the procedure or file.
.PP
The commands for examining data are:
.nr xx \w'control-D\ '
.TP \n(xxu
.B t
Print a stack trace of the terminated or stopped program.
.TP
.B T
Print the top line of the stack trace.
.TP
.IB variable / lm 
.PD
.TP
.IB variable ? lm 
Print the value of the variable according to (an optional)
length
.I l
and format
.I m.
By default
.I l
and
.I m
are taken from the variable's declaration.
The length specifier for formats
.B duox
is
.BR b 
(1 byte),
.BR h 
(2 bytes),
or
.BR l
(4 bytes, default).
For formats
.B s
and
.BR a 
it is an integer string length.
Punctuation
.B /
designates variables in data segments,
.B ?
in the text segment.
Legal values for format
.I m
are:
.PD
.RS
.TP
.B c
character
.PD0
.TP
.B d
decimal
.TP
.B u
decimal, unsigned
.TP
.B o
octal
.TP
.B x
hexadecimal
.TP
.B f
32 bit single precision floating point
.TP
.B g
64 bit double precision floating point
.TP
.B s
Assume variable is a string pointer and print characters until a null is
reached.
.TP
.B a
Print characters starting at the variable's address until a null
is reached.
.TP
.B p
pointer to procedure
.TP
.B i
machine instruction
.PD
.RE
.TP \n(xxu
\fIvariable\f5=\fP\fIlm\fR
.br
.ns
.TP
\fIlinenumber\f5=\fP\fIlm\fR
.br
.ns
.TP
\fInumber\f5=\fP\fIlm\fR
Print the address of the variable or line number or the value of the number
in the specified format,
.B lx
by default.
The last variant may be used to convert
number bases.
.TP
.IB variable ! value
Set the variable to the given value.
The value may be an integer or character constant, a variable, or
a floating-point constant
(if
.I variable
is float or double).
.PP
The commands for examining source files are
.TP \n(xxu
.BI e " procedure"
.br
.ns
.TP
.BI e " filename" .c
Set the current line and file.
If no name is given, report the current procedure and file.
.TP
.BI / "regular expression" /
Search forward as in
.IR ed (1).
.TP
.BI ? "regular expression" ?
Search backward.
.TP
.B p
Print the current line.
.TP
.B z
Print the current line and 9 more;
set the current line to the last one printed.
.TP
control-D
Print the next 10 lines;
set the current line to the last one printed.
.TP
.B w
Window.
Print the 10 lines around the current line.
.TP
.I number
Set the current line and print it.
.TP
.IB count " +"
Advance the current line by \fIcount\fP lines.
Print the new current line.
.TP
.IB count " -"
Retreat the current line by
.I count
lines.
Print the new current line.
.PP
The commands for controlling the execution of the source program are:
.TP \n(xxu
.IB count " r " args
.br
.ns
.TP
.IB count " R"
Run the program with the given arguments.
The
.B r
command with no arguments reuses the previous arguments
to the program while the
.B R
command
runs the program with no arguments.
An argument beginning with 
.L <
or 
.L >
causes redirection for the
standard input or output respectively.
.I Count,
if given,
specifies a number of breakpoints to be ignored.
.TP
.IB linenumber " c " count
.br
.ns
.TP
.IB linenumber " C " count
Continue after a breakpoint or interrupt.
.I Count
is as for
.LR r .
.B C
continues with the signal which caused the program to stop and
.B c
ignores it.
If a
.I linenumber
is given, a temporary breakpoint is placed there and is
deleted when the command finishes.
.TP
.IB count " s"
Single step.
Run the program through
.I count
lines, one line by default.
.TP
.IB count " S"
Single step, but step through subroutine calls.
.TP
.B k
Kill the debugged program.
.TP
.IB procedure ( arg1,arg2,... )/  m 
Execute the named procedure with the given arguments.
Arguments can be variables in scope or integer,
character or string constants.
If a format,
.BI / m,
is given, print the result in that form, otherwise
.LR d .
.TP
.I linenumber " b " commands
Set a breakpoint at the given line.
If a procedure name without a line number is given (e.g.
.LR proc: ),
a breakpoint is placed at the first line in the procedure.
If no
.I linenumber
is given,
a breakpoint is placed at the current line.
.IP
If no
.I commands
are given, stop execution just before the breakpoint.
Otherwise, when the breakpoint is encountered perform
the semicolon-separated
.I commands
and then continue execution.
.TP
.IB linenumber " d"
Delete a breakpoint at the given line.
If no
.I linenumber
is given,
each breakpoint location is printed and a line is read from the standard input.
Answer
.L y
or 
.L d
to delete it.
.TP
.B B
Print a list of the currently active breakpoints.
.TP
.B D
Delete all breakpoints.
.TP
.B l
Print the last executed line.
.TP
.IB linenumber " a
Announce.
If
.I linenumber
is of the form
.IB proc : number
the command does 
.LR "linenumber b\ l" 
(print the line each time it's reached).
If
.I linenumber
is of the form
.LR proc: ,
the command does
.L "proc: b T" 
(print the stack frame).
.PP
Miscellaneous commands.
.TP
.BI ! " command"
The command is interpreted by
.IR sh (1).
.TP
newline
Advance to the next storage location or source line,
depending on which was last printed, and display it.
.TP
\f5"\fI string\fR
Print the given string.
.TP
.B q
Exit the debugger.
.PP
The following commands are intended for
debugging the debugger.
.TP \n(xxu
.B V
Print the version number.
.PD0
.TP
.B X
Print a list of procedures and files being debugged.
.TP
.B Y
Toggle debug output.
.PD
.SH FILES
.F a.out
.br
.F core
.SH SEE ALSO
.IR adb (1), 
.IR pi (9.1), 
.IR cin (1),
.IR nm (1),
.IR a.out (5),
.IR bigcore (1),
.IR cc (1),
.IR f77 (1)
.SH BUGS
.I Sdb
is old and unmaintained.
.br
If a procedure is called when the program is not
stopped at a breakpoint, a fresh core image results.
Thus a procedure can't be used to extract data from a dump.
.br
.I Sdb 
doesn't know Fortran: arrays are singly dimensioned
and 0-indexed; scalar arguments are reported as pointers.
.br
The default type for printing Fortran parameters is incorrect:
address instead of value.
.br
Tracebacks containing Fortran subprograms with multiple entry points
may print too many arguments in the wrong order, but their values
are correct.
.br
The meaning of control-D is nonstandard.

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