Chapter 1
Debugger User’s Guide
Debugger is a graphical tool which can be used for debugging and testing of Erlang programs. For
example, breakpoints can be set, code can be single stepped and variable values can be displayed and
changed.
1.1 Debugger
1.1.1 Introduction
Debugger is a graphical user interface for the Erlang interpreter, which can be used for debugging and
testing of Erlang programs. For example, breakpoints can be set, code can be single stepped and variable
values can be displayed and changed.
The Erlang interpreter can also be accessed via the interface module int, see int(3) [page 29].
Warning: Note that the Debugger at some point might start tracing on the processes which execute the
interpreted code. This means that a conflict will occur if tracing by other means is started on any of
these processes.
1.1.2 Getting Started with Debugger
Start Debugger by calling debugger:start(). It will start the Monitor window [page 6] showing
information about all debugged processes, interpreted modules and selected options.
Initially there are normally no debugged processes. First, it must be specified which modules should be
debugged,orinterpreted as it is also called. This is done by chosing Module-
>
Interpret... in the Monitor
window and then selecting the appropriate modules from the Interpret Dialog window [page 10].
Note:
Only modules compiled with the option debug info set can be interpreted. Non-interpretable
modules are shown within parenthesis in the Interpret Dialog window.
When a module is interpreted, it can be viewed in a View Module window [page 15]. This is done by
selecting the module from the Module-
>
module-
>
View menu. The contents of the source file is shown
and it is possible to set breakpoints [page 2].
1
Debugger Application (DEBUGGER)
