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<a name="GDB%2fMI-Support-Commands"></a>
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<a name="GDB_002fMI-Support-Commands"></a>
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Next: <a rel="next" accesskey="n" href="GDB_002fMI-Miscellaneous-Commands.html#GDB_002fMI-Miscellaneous-Commands">GDB/MI Miscellaneous Commands</a>,
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Previous: <a rel="previous" accesskey="p" href="GDB_002fMI-Ada-Exceptions-Commands.html#GDB_002fMI-Ada-Exceptions-Commands">GDB/MI Ada Exceptions Commands</a>,
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Up: <a rel="up" accesskey="u" href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>
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</div>
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<h3 class="section">27.23 <span class="sc">gdb/mi</span> Support Commands</h3>
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<p>Since new commands and features get regularly added to <span class="sc">gdb/mi</span>,
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some commands are available to help front-ends query the debugger
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about support for these capabilities. Similarly, it is also possible
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to query <span class="sc">gdb</span> about target support of certain features.
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<h4 class="subheading">The <code>-info-gdb-mi-command</code> Command</h4>
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<p><a name="index-g_t_0040code_007b_002dinfo_002dgdb_002dmi_002dcommand_007d-3081"></a><a name="index-g_t_002dinfo_002dgdb_002dmi_002dcommand-3082"></a>
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<h5 class="subsubheading">Synopsis</h5>
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<pre class="smallexample"> -info-gdb-mi-command <var>cmd_name</var>
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</pre>
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<p>Query support for the <span class="sc">gdb/mi</span> command named <var>cmd_name</var>.
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<p>Note that the dash (<code>-</code>) starting all <span class="sc">gdb/mi</span> commands
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is technically not part of the command name (see <a href="GDB_002fMI-Input-Syntax.html#GDB_002fMI-Input-Syntax">GDB/MI Input Syntax</a>), and thus should be omitted in <var>cmd_name</var>. However,
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for ease of use, this command also accepts the form with the leading
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dash.
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<h5 class="subsubheading"><span class="sc">gdb</span> Command</h5>
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<p>There is no corresponding <span class="sc">gdb</span> command.
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<h5 class="subsubheading">Result</h5>
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<p>The result is a tuple. There is currently only one field:
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<dl>
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<dt>‘<samp><span class="samp">exists</span></samp>’<dd>This field is equal to <code>"true"</code> if the <span class="sc">gdb/mi</span> command exists,
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<code>"false"</code> otherwise.
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</dl>
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<h5 class="subsubheading">Example</h5>
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<p>Here is an example where the <span class="sc">gdb/mi</span> command does not exist:
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<pre class="smallexample"> -info-gdb-mi-command unsupported-command
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^done,command={exists="false"}
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</pre>
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<p class="noindent">And here is an example where the <span class="sc">gdb/mi</span> command is known
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to the debugger:
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<pre class="smallexample"> -info-gdb-mi-command symbol-list-lines
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^done,command={exists="true"}
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</pre>
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<h4 class="subheading">The <code>-list-features</code> Command</h4>
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<p><a name="index-g_t_002dlist_002dfeatures-3083"></a><a name="index-supported-_0040sc_007bgdb_002fmi_007d-features_002c-list-3084"></a>
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Returns a list of particular features of the MI protocol that
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this version of gdb implements. A feature can be a command,
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or a new field in an output of some command, or even an
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important bugfix. While a frontend can sometimes detect presence
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of a feature at runtime, it is easier to perform detection at debugger
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startup.
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<p>The command returns a list of strings, with each string naming an
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available feature. Each returned string is just a name, it does not
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have any internal structure. The list of possible feature names
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is given below.
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<p>Example output:
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<pre class="smallexample"> (gdb) -list-features
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^done,result=["feature1","feature2"]
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</pre>
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<p>The current list of features is:
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<dl>
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<dt>‘<samp><span class="samp">frozen-varobjs</span></samp>’<a name="index-frozen_002dvarobjs-3085"></a><dd>Indicates support for the <code>-var-set-frozen</code> command, as well
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as possible presense of the <code>frozen</code> field in the output
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of <code>-varobj-create</code>.
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<br><dt>‘<samp><span class="samp">pending-breakpoints</span></samp>’<a name="index-pending_002dbreakpoints-3086"></a><dd>Indicates support for the <samp><span class="option">-f</span></samp> option to the <code>-break-insert</code>
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command.
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<br><dt>‘<samp><span class="samp">python</span></samp>’<a name="index-python-3087"></a><dd>Indicates Python scripting support, Python-based
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pretty-printing commands, and possible presence of the
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‘<samp><span class="samp">display_hint</span></samp>’ field in the output of <code>-var-list-children</code>
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<br><dt>‘<samp><span class="samp">thread-info</span></samp>’<a name="index-thread_002dinfo-3088"></a><dd>Indicates support for the <code>-thread-info</code> command.
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<br><dt>‘<samp><span class="samp">data-read-memory-bytes</span></samp>’<a name="index-data_002dread_002dmemory_002dbytes-3089"></a><dd>Indicates support for the <code>-data-read-memory-bytes</code> and the
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<code>-data-write-memory-bytes</code> commands.
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<br><dt>‘<samp><span class="samp">breakpoint-notifications</span></samp>’<a name="index-breakpoint_002dnotifications-3090"></a><dd>Indicates that changes to breakpoints and breakpoints created via the
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CLI will be announced via async records.
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<br><dt>‘<samp><span class="samp">ada-task-info</span></samp>’<a name="index-ada_002dtask_002dinfo-3091"></a><dd>Indicates support for the <code>-ada-task-info</code> command.
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<br><dt>‘<samp><span class="samp">language-option</span></samp>’<a name="index-language_002doption-3092"></a><dd>Indicates that all <span class="sc">gdb/mi</span> commands accept the <samp><span class="option">--language</span></samp>
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option (see <a href="Context-management.html#Context-management">Context management</a>).
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<br><dt>‘<samp><span class="samp">info-gdb-mi-command</span></samp>’<a name="index-info_002dgdb_002dmi_002dcommand-3093"></a><dd>Indicates support for the <code>-info-gdb-mi-command</code> command.
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<br><dt>‘<samp><span class="samp">undefined-command-error-code</span></samp>’<a name="index-undefined_002dcommand_002derror_002dcode-3094"></a><dd>Indicates support for the "undefined-command" error code in error result
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records, produced when trying to execute an undefined <span class="sc">gdb/mi</span> command
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(see <a href="GDB_002fMI-Result-Records.html#GDB_002fMI-Result-Records">GDB/MI Result Records</a>).
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<br><dt>‘<samp><span class="samp">exec-run-start-option</span></samp>’<a name="index-exec_002drun_002dstart_002doption-3095"></a><dd>Indicates that the <code>-exec-run</code> command supports the <samp><span class="option">--start</span></samp>
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option (see <a href="GDB_002fMI-Program-Execution.html#GDB_002fMI-Program-Execution">GDB/MI Program Execution</a>).
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<br><dt>‘<samp><span class="samp">data-disassemble-a-option</span></samp>’<a name="index-data_002ddisassemble_002da_002doption-3096"></a><dd>Indicates that the <code>-data-disassemble</code> command supports the <samp><span class="option">-a</span></samp>
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option (see <a href="GDB_002fMI-Data-Manipulation.html#GDB_002fMI-Data-Manipulation">GDB/MI Data Manipulation</a>).
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</dl>
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<h4 class="subheading">The <code>-list-target-features</code> Command</h4>
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<p><a name="index-g_t_002dlist_002dtarget_002dfeatures-3097"></a>
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Returns a list of particular features that are supported by the
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target. Those features affect the permitted MI commands, but
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unlike the features reported by the <code>-list-features</code> command, the
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features depend on which target GDB is using at the moment. Whenever
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a target can change, due to commands such as <code>-target-select</code>,
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<code>-target-attach</code> or <code>-exec-run</code>, the list of target features
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may change, and the frontend should obtain it again.
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Example output:
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<pre class="smallexample"> (gdb) -list-target-features
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^done,result=["async"]
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</pre>
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<p>The current list of features is:
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<dl>
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<dt>‘<samp><span class="samp">async</span></samp>’<dd>Indicates that the target is capable of asynchronous command
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execution, which means that <span class="sc">gdb</span> will accept further commands
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while the target is running.
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<br><dt>‘<samp><span class="samp">reverse</span></samp>’<dd>Indicates that the target is capable of reverse execution.
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See <a href="Reverse-Execution.html#Reverse-Execution">Reverse Execution</a>, for more information.
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</dl>
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