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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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<TITLE>Debugging with GDB: Interpreters</TITLE>
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<A NAME="SEC234"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_21.html#SEC233"> < </A>]</TD>
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<H1> 21. Command Interpreters </H1>
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<!--docid::SEC234::-->
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<P>
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GDB supports multiple command interpreters, and some command
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infrastructure to allow users or user interface writers to switch
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between interpreters or run commands in other interpreters.
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</P><P>
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GDB currently supports two command interpreters, the console
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interpreter (sometimes called the command-line interpreter or CLI)
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and the machine interface interpreter (or GDB/MI). This manual
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describes both of these interfaces in great detail.
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</P><P>
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By default, GDB will start with the console interpreter.
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However, the user may choose to start GDB with another
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interpreter by specifying the <SAMP>`-i'</SAMP> or <SAMP>`--interpreter'</SAMP>
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startup options. Defined interpreters include:
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</P><P>
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<DL COMPACT>
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<DT><CODE>console</CODE>
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<DD><A NAME="IDX1214"></A>
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The traditional console or command-line interpreter. This is the most often
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used interpreter with GDB. With no interpreter specified at runtime,
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GDB will use this interpreter.
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<P>
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<DT><CODE>mi</CODE>
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<DD><A NAME="IDX1215"></A>
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The newest GDB/MI interface (currently <CODE>mi2</CODE>). Used primarily
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by programs wishing to use GDB as a backend for a debugger GUI
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or an IDE. For more information, see <A HREF="gdb_25.html#SEC242">The GDB/MI Interface</A>.
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<P>
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<DT><CODE>mi2</CODE>
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<DD><A NAME="IDX1216"></A>
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The current GDB/MI interface.
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<P>
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<DT><CODE>mi1</CODE>
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<DD><A NAME="IDX1217"></A>
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The GDB/MI interface included in GDB 5.1, 5.2, and 5.3.
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<P>
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</DL>
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<P>
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<A NAME="IDX1218"></A>
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The interpreter being used by GDB may not be dynamically
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switched at runtime. Although possible, this could lead to a very
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precarious situation. Consider an IDE using GDB/MI. If a user
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enters the command "interpreter-set console" in a console view,
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GDB would switch to using the console interpreter, rendering
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the IDE inoperable!
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</P><P>
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<A NAME="IDX1219"></A>
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Although you may only choose a single interpreter at startup, you may execute
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commands in any interpreter from the current interpreter using the appropriate
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command. If you are running the console interpreter, simply use the
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<CODE>interpreter-exec</CODE> command:
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</P><P>
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<TABLE><tr><td> </td><td class=smallexample><FONT SIZE=-1><pre>interpreter-exec mi "-data-list-register-names"
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</FONT></pre></td></tr></table></P><P>
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GDB/MI has a similar command, although it is only available in versions of
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GDB which support GDB/MI version 2 (or greater).
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</P><P>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdb_toc.html#SEC_Contents">Contents</A>]</TD>
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<address>
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<p>Please send FSF & GNU inquiries & questions to <a
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href="mailto:gnu@gnu.org">gnu@gnu.org</a>. There are also <a
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href="http://www.gnu.org/home.html#ContactInfo">other ways to
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contact</a> the FSF.</p>
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<p>These pages are maintained by <a
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href="http://www.gnu.org/software/gdb/">the GDB developers</a>.</p>
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330, Boston, MA 02111, USA.</p>
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<p>Verbatim copying and distribution of this entire article is
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