X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperldebug.pod;h=390eb967822d843d682951d3369051de9ca313fb;hb=a365f2ce4defc0d7fecd4e9484f8f958454c9192;hp=9a8d02fa265c79ca268ede443882fd290abcd732;hpb=2e8f3c35926871095feda1ba18dbe8ffc40a0273;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perldebug.pod b/pod/perldebug.pod index 9a8d02f..390eb96 100644 --- a/pod/perldebug.pod +++ b/pod/perldebug.pod @@ -1,4 +1,5 @@ =head1 NAME +X X perldebug - Perl debugging @@ -19,6 +20,7 @@ source code, set breakpoints, get stack backtraces, change the values of variables, etc. This is so convenient that you often fire up the debugger all by itself just to test out Perl constructs interactively to see what they do. For example: +X<-d> $ perl -d -e 42 @@ -59,6 +61,7 @@ The debugger understands the following commands: =over 12 =item h +X Prints out a summary help message @@ -80,6 +83,7 @@ You may change the pager which is used via C command. =item p expr +X Same as C in the current package. In particular, because this is just Perl's own C function, this means that nested @@ -89,6 +93,7 @@ The C filehandle is opened to F, regardless of where STDOUT may be redirected to. =item x [maxdepth] expr +X Evaluates its expression in list context and dumps out the result in a pretty-printed fashion. Nested data structures are printed out @@ -104,6 +109,7 @@ dumped only I levels deep, as if the C option had been temporarily set to I. =item V [pkg [vars]] +X Display all (or some) variables in package (defaulting to C
) using a data pretty-printer (hashes show their keys and values so @@ -118,10 +124,12 @@ Use C<~pattern> and C for positive and negative regexes. This is similar to calling the C command on each applicable var. =item X [vars] +X Same as C. =item y [level [vars]] +X Display all (or some) lexical variables (mnemonic: C variables) in the current scope or I scopes higher. You can limit the @@ -132,16 +140,19 @@ is pretty-printed in the same style as for C and the format is controlled by the same options. =item T +X X X Produce a stack backtrace. See below for details on its output. =item s [expr] +X X Single step. Executes until the beginning of another statement, descending into subroutine calls. If an expression is supplied that includes function calls, it too will be single-stepped. =item n [expr] +X Next. Executes over subroutine calls, until the beginning of the next statement. If an expression is supplied that includes @@ -149,6 +160,7 @@ function calls, those functions will be executed with stops before each statement. =item r +X Continue until the return from the current subroutine. Dump the return value if the C option is set (default). @@ -158,11 +170,13 @@ Dump the return value if the C option is set (default). Repeat last C or C command. =item c [line|sub] +X Continue, optionally inserting a one-time-only breakpoint at the specified line or subroutine. =item l +X List next window of lines. @@ -184,19 +198,23 @@ List first window of lines from subroutine. I may be a variable that contains a code reference. =item - +X List previous window of lines. =item v [line] +X View a few lines of code around the current line. =item . +X Return the internal debugger pointer to the line last executed, and print out that line. =item f filename +X Switch to viewing a different file or C statement. If I is not a full pathname found in the values of %INC, it is considered @@ -219,27 +237,35 @@ Search backwards for pattern; final ? is optional. The search is case-insensitive by default. =item L [abw] +X List (default all) actions, breakpoints and watch expressions =item S [[!]regex] +X List subroutine names [not] matching the regex. =item t +X Toggle trace mode (see also the C option). =item t expr +X Trace through execution of C. See L for examples. =item b +X +X Sets breakpoint on current line =item b [line] [condition] +X +X Set a breakpoint before the given line. If a condition is specified, it's evaluated each time the statement is reached: a @@ -252,34 +278,47 @@ don't use C: b 33 /pattern/i =item b subname [condition] +X +X Set a breakpoint before the first line of the named subroutine. I may be a variable containing a code reference (in this case I is not supported). =item b postpone subname [condition] +X +X Set a breakpoint at first line of subroutine after it is compiled. =item b load filename +X +X Set a breakpoint before the first executed line of the I, which should be a full pathname found amongst the %INC values. =item b compile subname +X +X Sets a breakpoint before the first statement executed after the specified subroutine is compiled. =item B line +X +X Delete a breakpoint from the specified I. =item B * +X +X Delete all installed breakpoints. =item a [line] command +X Set an action to be done before the line is executed. If I is omitted, set an action on the line about to be executed. @@ -297,39 +336,48 @@ For example, this will print out $foo every time line a 53 print "DB FOUND $foo\n" =item A line +X Delete an action from the specified line. =item A * +X Delete all installed actions. =item w expr +X Add a global watch-expression. We hope you know what one of these is, because they're supposed to be obvious. =item W expr +X Delete watch-expression =item W * +X Delete all watch-expressions. =item o +X Display all options =item o booloption ... +X Set each listed Boolean option to the value C<1>. =item o anyoption? ... +X Print out the value of one or more options. =item o option=value ... +X Set the value of one or more options. If the value has internal whitespace, it should be quoted. For example, you could set C for a list of these. =item < ? +X<< debugger command, < >> List out all pre-prompt Perl command actions. =item < [ command ] +X<< debugger command, < >> Set an action (Perl command) to happen before every debugger prompt. A multi-line command may be entered by backslashing the newlines. =item < * +X<< debugger command, < >> Delete all pre-prompt Perl command actions. =item << command +X<< debugger command, << >> Add an action (Perl command) to happen before every debugger prompt. A multi-line command may be entered by backwhacking the newlines. =item > ? +X<< debugger command, > >> List out post-prompt Perl command actions. =item > command +X<< debugger command, > >> Set an action (Perl command) to happen after the prompt when you've just given a command to return to executing the script. A multi-line @@ -379,16 +433,19 @@ command may be entered by backslashing the newlines (we bet you couldn't've guessed this by now). =item > * +X<< debugger command, > >> Delete all post-prompt Perl command actions. =item >> command +X<<< debugger command, >> >>> Adds an action (Perl command) to happen after the prompt when you've just given a command to return to executing the script. A multi-line command may be entered by backslashing the newlines. =item { ? +X List out pre-prompt debugger commands. @@ -403,28 +460,34 @@ what you mean to do, write it as with C<;{ ... }> or even C. =item { * +X Delete all pre-prompt debugger commands. =item {{ command +X Add an action (debugger command) to happen before every debugger prompt. A multi-line command may be entered, if you can guess how: see above. =item ! number +X Redo a previous command (defaults to the previous command). =item ! -number +X Redo number'th previous command. =item ! pattern +X Redo last command that started with pattern. See C, too. =item !! cmd +X Run cmd in a subprocess (reads from DB::IN, writes to DB::OUT) See C, also. Note that the user's current shell (well, @@ -433,16 +496,20 @@ with proper interpretation of exit status or signal and coredump information. =item source file +X Read and execute debugger commands from I. I may itself contain C commands. =item H -number +X Display last n commands. Only commands longer than one character are listed. If I is omitted, list them all. =item q or ^D +X +X Quit. ("quit" doesn't work for this, unless you've made an alias) This is the only supported way to exit the debugger, though typing @@ -453,6 +520,7 @@ off the end the script. You may also need to set $finished to 0 if you want to step through global destruction. =item R +X Restart the debugger by Cing a new session. We try to maintain your history across this, but internal settings and command-line options @@ -463,14 +531,17 @@ actions, debugger options, and the Perl command-line options B<-w>, B<-I>, and B<-e>. =item |dbcmd +X Run the debugger command, piping DB::OUT into your current pager. =item ||dbcmd +X Same as C<|dbcmd> but DB::OUT is temporarily C