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Reference Manual
Version 3.2.7

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# i

### MODULE

i

### MODULE SUMMARY

Debugger/Interpreter Interface

### DESCRIPTION

The module i provides short forms for some of the functions used by the graphical Debugger and some of the functions in the int module, the Erlang interpreter.

This module also provides facilities for displaying status information about interpreted processes and break points.

It is possible to attach to interpreted processes by giving the corresponding process identity only. By default, an attachment window pops up. Processes at other Erlang nodes can be attached manually or automatically.

By preference, these functions can be included in the module shell_default. By default, they are.

### EXPORTS

im() -> pid()

Starts a new graphical monitor. This is the Monitor window, the main window of the Debugger. All of the Debugger and interpreter functionality is accessed from the Monitor window. The Monitor window displays the status of all processes that have been/are executing interpreted modules.

ii(AbsModules) -> ok
ii(AbsModule) -> {module, Module} | error
ini(AbsModules) -> ok
ini(AbsModule) -> {module, Module} | error

Types:

AbsModules = [AbsModule]
AbsModule = Module | File
Module = atom()
File = string()

Interprets the specified module(s). ii/1 interprets the module(s) only at the current node, see int:i/1. ini/1 interprets the module(s) at all known nodes, see int:ni/1.

iq(AbsModule) -> ok
inq(AbsModule) -> ok

Types:

AbsModule = Module | File
Module = atom()
File = string()

Stops interpreting the specified module. iq/1 stops interpreting the module only at the current node. inq/1 stops interpreting the module at all known nodes.

il() -> ok

Makes a printout of all interpreted modules. Modules are printed together with the full path name of the corresponding source code file.

ip() -> ok

Makes a printout of the current status of all interpreted processes.

ic() -> ok

Clears information about processes executing interpreted code byt removing all information about terminated processes.

iaa(Flags) -> true
iaa(Flags, Function) -> true

Types:

Flags = [init | break | exit]
Function = {Module,Name,Args}
Module = Name = atom()
Args = [term()]

Sets when and how to automatically attach to a debugged process, see int:auto_attach/2. Function defaults to the standard function used by the Debugger.

ist(Flag) -> true

Types:

Flag = all | no_tail | false

Sets how to save call frames in the stack, see int:stack_trace/1.

ia(Pid) -> ok | no_proc

Types:

Pid = pid()

Attaches to the debugged process Pid. A Debugger Attach Process window is opened for the process.

ia(X,Y,Z) -> ok | no_proc

Types:

X = Y = Z = int()

Same as ia(Pid), where Pid is the result of calling the shell function pid(X,Y,Z).

ia(Pid, Function) -> ok | no_proc

Types:

Pid = pid()
Function = {Module,Name}
Module = Name = atom()

Attaches to the debugged process Pid. The interpreter will call spawn(Module, Name, [Pid]) (and ignore the result).

ia(X,Y,Z, Function) -> ok | no_proc

Types:

X = Y = Z = int()
Function = {Module,Name}
Module = Name = atom()

Same as ia(Pid, Function), where Pid is the result of calling the shell function pid(X,Y,Z). An attached process is expected to call the unofficial int:attached(Pid) function and to be able to handle messages from the interpreter, see dbg_ui_trace.erl for an example.

ib(Module, Line) -> ok | {error, break_exists}

Types:

Module = atom()
Line = int()

Creates a breakpoint at Line in Module.

ib(Module, Name, Arity) -> ok | {error, function_not_found}

Types:

Module = Name = atom()
Arity = int()

Creates breakpoints at the first line of every clause of the Module:Name/Arity function.

ir() -> ok

Deletes all breakpoints.

ir(Module) -> ok

Types:

Module = atom()

Deletes all breakpoints in Module.

ir(Module, Line) -> ok

Types:

Module = atom()
Line = int()

Deletes the breakpoint located at Line in Module.

ir(Module, Name, Arity) -> ok | {error, function_not_found}

Types:

Module = Name = atom()
Arity = int()

Deletes the breakpoints at the first line of every clause of the Module:Name/Arity function.

ibd(Module, Line) -> ok

Types:

Module = atom()
Line = int()

Makes the breakpoint at Line in Module inactive.

ibe(Module, Line) -> ok

Types:

Module = atom()
Line = int()

Makes the breakpoint at Line in Module active.

iba(Module, Line, Action) -> ok

Types:

Module = atom()
Line = int()
Action = enable | disable | delete

Sets the trigger action of the breakpoint at Line in Module to Action.

ibc(Module, Line, Function) -> ok

Types:

Module = atom()
Line = int()
Function = {Module,Name}
Name = atom()

Sets the conditional test of the breakpoint at Line in Module to Function.

The conditional test is performed by calling Module:Name(Bindings), where Bindings is the current variable bindings. The function must return true (break) or false (do not break). Use int:get_binding(Var, Bindings) to retrieve the value of a variable Var.

ipb() -> ok

Makes a printout of all existing breakpoints.

ipb(Module) -> ok

Types:

Module = atom()

Makes a printout of all existing breakpoints in Module.

iv() -> atom()

Returns the current version number of the interpreter. The same as the version number of the Debugger application.

help() -> ok

Prints help text.

### Usage

Refer to the Debugger User's Guide for information about the Debugger.

### See Also

int(3)