Fix load-elim bug for branching instructions going to the same block

[hiphop-php.git] / hphp / doc / debugger.refs

    --------------------------- Abort Command ---------------------------

    [a]bort              aborts current PHP code input


You will have to type this command on a new line, while you're typing
ad-hoc PHP code to evaluate. In other words, it only works when you see
continuation prompt like ">>>>".


    --------------------------- Break Command ---------------------------

    [b]reak                               breaks at current line of code
    [b]reak {exp}                         breaks at matching location

    [b]reak [o]nce  {above}               breaks just once then disables it

    [b]reak {above} if {php}              breaks if condition meets
    [b]reak {above} && {php}              breaks and evaluates an expression

    [b]reak [l]ist                        lists all breakpoints
    [b]reak [c]lear {index}               clears the n-th breakpoint on list
    [b]reak [c]lear [a]ll                 clears all breakpoints
    [b]reak [c]lear                       clears current breakpoint
    [b]reak [t]oggle {index}              toggles the n-th breakpoint on list
    [b]reak [t]oggle [a]ll                toggles all breakpoints
    [b]reak [t]oggle                      toggles current breakpoint
    [b]reak [e]nable {index}              enables the n-th breakpoint on list
    [b]reak [e]nable [a]ll                enables all breakpoints
    [b]reak [e]nable                      enables current breakpoint
    [b]reak [d]isable {index}             disables the n-th breakpoint on list
    [b]reak [d]isable [a]ll               disables all breakpoints
    [b]reak [d]isable                     disables current breakpoint


    -------------------------- Where to break? --------------------------

There are many ways to specify a source file location to set a breakpoint,
but it's ONE single string without whitespaces. The format looks like this,

        file location: {file}:{line}
        function call: {func}()
        method invoke: {cls}::{method}()

For examples,

        b mypage.php:123
        b foo()
        b MyClass::foo()

    ------------------------ Special Breakpoints ------------------------

There are special breakpoints what can only be set by names:

      start
      end
      psp

They represent different time points of a web request. 'start' is at the
beginning of a web request, when no PHP file is invoked yet, but query
string and server variables are already prepared. 'end' is at the end of
a web request, but BEFORE post-send processing (psp). 'psp' is at END of
psp, not beginning. To set a breakpoint at the beginning of psp, use
'end', because end of a request is the same as beginning of psp.

    -------------- Conditional Breakpoints and Watchpoints --------------

Every breakpoint can specify a condition, which is an arbitrary PHP expression
that will be evaluated to TRUE or FALSE. When TRUE, it will break. When FALSE,
it will continue without break. "&&" is similar to "if", except it will always
break, regardless what the expression returns. This is useful to watch
variables at breakpoints. For example,

        b mypage.php:123 && print $a

So every time it breaks at mypage.php line 123, it will print out $a.

    -------------------------- Call chains -------------------------------

Function/method call breakpoints can be qualified with the names of
functions or methods that must be calling the right most function/method
name for execution to stop at the breakpoint. These calls need not be
direct calls. The syntax looks like this:
    {call}=>{call}()
where call is either a {func} or {cls}::{method} and zero or more
"{call}=>" clauses can be specified.

    --------------------- Breakpoint States and List ---------------------

Every breakpoint has 3 states: ALWAYS, ONCE, DISABLED. Without keyword "once",
a breakpoint is in ALWAYS state. ONCE breakpoints will turn into DISABLED after
it's hit once. DISABLED breakpoints will not break, but they are kept in the
list, so one can run 'b l' command and 'b t' command to toggle their states.

Use '[b]reak [l]ist' command to view indices of different breakpoints. Then use
those indices to clear or toggle their states. This list of breakpoints and
their states will remain the same when switching to different machines,
sandboxes and threads.

    -------------------------- Hard Breakpoints --------------------------

From within PHP code, you can place a function call hphpd_break() to embed a
breakpoint. You may also specify a condition as the function's parameter, so it
breaks when the condition is met. Please read about this function for more
details with '[i]nfo hphpd_break'.

    -------------------------- Continue Command --------------------------

    [c]ontinue           continues program execution
      {count=1}


Use this command at break to resume program execution. Specify a count
to repeat the same command many times.


    ---------------------------- Down Command ----------------------------

    [d]own {num=1}       moves to inner frames (callees) on stacktrace


Use this command to walk down on stacktrace to find out inner callees of
current frame. By default it moves down by one level. Specify a number
to move down several levels a time.


    ------------------------- Exception Command -------------------------

    [e]xception {cls}    breaks if class of exception throws
    [e]xception          breaks if class of exception throws
      {ns}\{cls}
    [e]xception error    breaks on errors, warnings and notices
    [e]xception          breaks only if url also matches
      {above}@{url}

    [e]xception          breaks at matching regex pattern
      [r]egex {above}
    [e]xception          breaks just once then disables it
      [o]nce  {above}

    [e]xception          breaks if condition meets
      {above} if {php}
    [e]xception          breaks and evaluates an expression
      {above} && {php}


Exception command is similar to '[b]reak' command, except it's used to
specify how to break on (or catch) a throw of an exception. Program
stops right before the exception is about to throw. Resuming program
execution will continue to throw the exception as is.

Only a class name can be specified with an optional namespace. All
exceptions of the class or its sub-classes will be matched. To specify a
perfect match without sub-classing test, use '[e]xception [r]egex
^{exact class name}$', although regex can match in a lot more different
ways.

An exception breakpoint can be listed, cleared or toggled with '[b]reak'
commands.


    --------------------------- Frame Command ---------------------------

    [f]rame {index}      jumps to one particular frame


Use '[w]here' command to find out the frame number. Use 'f 0' to jump
back to the most recent frame or the innermost frame. Use 'f 999' or
some big number to jump to the outermost frame.


    --------------------------- Global Command ---------------------------

    [g]lobal             lists all global variables
    [g]lobal {text}      full-text search global variables


This will print names and values of all global variables, if {text} is
not speified. Otherwise, it will print global variables that contain the
text in their names or values. The search is case-insensitive and
string-based.


    ---------------------------- Help Command ----------------------------

    [h]elp [s]tart       displays material for getting started
    [h]elp [t]utorial    changing tutorial modes
      on|off|auto


Please read "Getting Started" material with '[h]elp [s]tart' for first
time use to get yourself familiar with basics.

Tutorial mode displays extra information when something didn't work as
you expected. "auto" mode will display the same information just once.
"on" mode will display it as long as you run into the same situation.
"off" mode completely turns off all tutorial texts.

To get detailed information of a command, type '{cmd} [h]elp' or '{cmd}
?' or 'help {cmd}' or '? {cmd}'.


    ---------------------------- Info Command ----------------------------

    info                 displays current function's info
    info {cls}           displays declaration of this class
    info {function}      displays declaration of this function
    info                 displays declaration of this method
      {cls::method}
    info                 displays declaration of this constant
      {cls::constant}
    info                 displays declaration of this property
      {cls::$property}


Use this command to display declaration of a symbol.


    -------------------------- Constant Command --------------------------

    [k]onstant           lists all constants
    [k]onstant {text}    full-text search constants


This will print names and values of all constants, if {text} is not
specified. Otherwise, it will print names and values of all constants
that contain the text in their names or values. The search is
case-insensitive and string-based.


    ---------------------------- List Command ----------------------------

    list                 displays current block of source code
    list {line}          displays code around specified line
    list                 displays specified block of source code
      {line1}-{line2}
    list {line1}-        displays code starting with the line
    list -{line2}        displays code ending with the line
    list {file}          displays beginning lines of the file
    list                 displays code around specified file:line
      {file}:{line}
    list                 displays specified block in the file
      {file}:{l1}-{l2}
    list {file}:{l1}-    displays specified block in the file
    list {file}:-{l2}    displays specified block in the file
    list {directory}     sets PHP source root directory


Use list command to display PHP source code. In remote debugging, this
is displaying source code on server side. When server side cannot find
the file, it will fall back to local files.

Hit return to display more lines of code after current display.

When a directory name is specified, this will be set to root directory
for resolving relative paths of PHP files. Files with absolute paths
will not be affected by this setting. This directory will be stored in
configuration file for future sessions as well.


    -------------------------- Machine Command ---------------------------

    [m]achine            debugging remote server natively
      [c]onnect {host}
    [m]achine            debugging remote server natively
      [c]onnect
      {host}:{port}
    [m]achine [r]pc      debugging remote server with RPC
      {host}
    [m]achine [r]pc      debugging remote server with RPC
      {host}:{port}
    [m]achine            disconnect, debug only local script
      [d]isconnect
    [m]achine [l]ist     list all sandboxes
    [m]achine            attach to a sandbox
      [a]ttach {index}
    [m]achine            attach to my sandbox by name
      [a]ttach
      {sandbox}
    [m]achine            attach to a sandbox by user and name
      [a]ttach {user}
      {sandbox}
    [m]achine            force attach to a sandbox (see below)
      [a]ttach [f]orce
      {index|sandbox|us
      er sandbox}


Use this command to switch between different machines or sandboxes.

If command prompt says "hphpd", all evaluation of PHP code happens
locally within the debugger. This is the mode when debugger is started
without a remote server name. No user libraries are pre-loaded in this
mode.

When connecting to a remote server, it will automatically attach to
"default" sandbox under current user. If "default" sandbox does not
exist, it will attach to a random sandbox under current user. In sandbox
mode, a file specified in server's configuration of
"Eval.Debugger.StartupDocument" is pre-loaded.

If there is no sandbox available, it will create a "dummy" sandbox and
attach to it.

When your sandbox is not available, please hit it at least once from
your browser. Then run '[m]achine [l]ist' command again.

If another debugger client is already attached to your sandbox you can
use the '[f]orce' option to '[m]achine [a]ttach'. This will disconnect
the other client and force your client to connect.

If a HipHop server has RPC port open, one can also debug the server in a
very special RPC mode. In this mode, one can type in PHP scripts to run,
but all functions will be executed on server through RPC. Because states
are still maintained locally and only functions are executed remotely,
it may not work with functions or scripts that depend on global
variables or low-level raw resource pointers. As a simple rule,
stateless functions will work just fine. This is true to objects and
method calls as well, except classes will have to be loaded on client
side by '=include("file-containing-the-class.php")'.


    ---------------------------- Next Command ----------------------------

    [n]ext {count=1}     steps over lines of code


Use this command at break to step over lines of code. Specify a count to
step over more than one line of code.


    ---------------------------- Out Command ----------------------------

    [o]ut {count=1}      steps out function calls


Use this command at break to step out function calls. Specify a count to
step out more than one level of function calls.


    --------------------------- Print Command ---------------------------

    [p]rint {php}        prints result of PHP code
    [p]rint r {php}      prints result of PHP code, (print_r)
    [p]rint v {php}      prints result of PHP code, (var_dump)
    [p]rint x {php}      prints hex encoded string or number
    [p]rint [h]ex        prints hex encoded string or number
      {php}
    [p]rint [o]ct        prints octal encoded string or number
      {php}
    [p]rint [d]ec        prints as signed integer
      {php}
    [p]rint              prints as unsigned integer
      [u]nsigned {php}
    [p]rint [t]ime       converts between time and timestamp
      {php}

    [p]rint [a]lways     adds a watch expression at break
      {above}
    [p]rint [l]ist       lists watch expressions
    [p]rint [c]lear      clears a watch expression
      {index}
    [p]rint [c]lear      clears all watch expressions
      [a]ll


Prints result of an expression in certain format. If '[a]lways' is
specified, the expression will be added to a watch list. At every break,
either at a breakpoint or caused by step commands, these expressions
will be evaluated and printed out.


    ---------------------------- Quit Command ----------------------------

    [q]uit               quits this program


After you type this command, you will not see me anymore.


    ---------------------------- Run Command ----------------------------

    [r]un                restarts program
    [r]un {file}         starts a new program
      {arg1} {arg2} ...


Aborts current execution and restarts program with specified arguments.
If no arguments are specified, it will reuse the PHP file and old
arguments. If arguments are to be changed, please include file name,
even if it is the same, as the first one.

In server mode, this command will simply abort current page handling
without restarting anything.


    ---------------------------- Set Command ----------------------------

    set bac on/off    on makes debugger bypass access checks on class members
    set lf path/off   turn logging on and specify log file
    set pl level      if level > 0, only print out object trees to that depth
    set cc count      display at most count characters when doing = command
    set ss on/off     on makes the debugger take small steps (not entire lines)
    set sa on/off     on makes where command display argument values
    set mcl limit     display at most limit source lines at breakpoints

Use this command to change default settings. The new values are persisted into
the configuration file that normally can be found at ~/.hphpd.ini.

Level, count and limit can be <= 0, in which case they are unlimited.

    ---------------------------- Step Command ----------------------------

    [s]tep {count=1}     steps into lines of code


Use this command at break to step into lines of code. Specify a count to
step more than once.


    --------------------------- Thread Command ---------------------------

    [t]hread             displays current thread's information
    [t]hread [l]ist      lists all threads at break
    [t]hread {index}     switches to the specified thread
    [t]hread [n]ormal    breaks all threads
    [t]hread [s]ticky    only send command to current thread
    [t]hread             only break current thread
      [e]xclusive


Use '[t]hread' alone to display information of current thread.

When a thread is at break, you may specify how other threads should
behave if they also happen to hit some breakpoints. Normally, other
threads will also break, and they will interrupt debugger session with
their breakpoints. So breaks from different threads may interleave. If
'[t]hread [s]ticky' is specified, all other threads will wait until
current thread is finished. This will help debugging to focus on just
one thread without losing breaks from other threads. If there is no need
to hold up any other threads, use '[t]hread [e]xclusive'. Then other
threads will not break at all. This mode is useful for live debugging a
production server, without interrupting many threads at a time. Use
'[t]hread [n]ormal' to change thread mode back to normal.

Some debugging commands will automatically turn thread mode to sticky.
These include continue, step, next or out commands with a counter of
more than 1. Or a jump command. These commands imply non-interruption
from another thread. The mode will remain even after these commands
until '[t]hread [n]ormal' is issued.
When multple threads hit breakpoints at the same time, use '[t]hread
[l]ist' command to display their indices, which can be used to switch
between them with '[t]hread {index}'.


    ----------------------------- Up Command -----------------------------

    [u]p {num=1}         moves to outer frames (callers) on stacktrace


Use this command to walk up on stacktrace to find out outer callers of
current frame. By default it moves up by one level. Specify a number to
move up several levels a time.


    -------------------------- Variable Command --------------------------

    [v]ariable           lists all local variables on stack
    [v]ariable {text}    full-text search local variables


This will print names and values of all variables that are currently
accessible by simple names. Use '[w]here', '[u]p {num}', '[d]own {num}',
'[f]rame {index}' commands to choose a different frame to view variables
at different level of the stack.

Specify some free text to print local variables that contain the text
either in their names or values. The search is case-insensitive and
string-based.


    --------------------------- Where Command ---------------------------

    [w]here              displays current stacktrace
    [w]here {num}        displays number of innermost frames
    [w]here -{num}       displays number of outermost frames


Use '[u]p {num}' or '[d]own {num}' to walk up or down the stacktrace.
Use '[f]rame {index}' to jump to one particular frame. At any frame, use
'[v]ariable' command to display all local variables.


    -------------------------- Extended Command --------------------------

    x {cmd} {arg1}       invoke specified command
      {arg2} ...
    x{cmd} {arg1}        invoke specified command
      {arg2} ...


where {cmd} can be:

        [a]mple
        [t]ension

Type 'x [h]elp|? {cmd} to read their usages.

    ---------------------------- Zend Command ----------------------------

    [z]end               running the most recent code snippet in PHP5


This is mainly for comparing results from PHP vs. HipHop. After you type
in some PHP code, it will be evaluated immediately in HipHop. Then you
can type '[z]end' command to re-run the same script in PHP5. Please
note that only the most recent block of code you manually typed in was
evaluated, not any earlier ones, nor the ones from a PHP file.


    --------------------------- Macro Command ---------------------------

    & [s]tart            starts recording of default macro
    & [s]tart {name}     starts recording of a named macro
    & [e]nd              stops and saves recorded macro
    & [r]eplay           replays default macro
    & [r]eplay {name}    replays a named macro
    & [l]ist             lists all macros
    & [c]lear {index}    deletes a macro


Macro command allows you to record a series of debugger command, so you
can replay later by its name. When name is not specified, it will use
"default" as the name.

There is also a special macro "startup" that will be replayed every time
when debugger is just started. Use startup macro to load certain PHP
files or perform certain debugging environment setup.

The space between & and command is not needed. '&s' works as well.


    --------------------------- Shell Command ---------------------------

! {cmd} {arg1} {arg2} ...    remotely executes shell command

Executes the shell command on connected machine.

The space between ! and command is not needed. '!ls' works as well.