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<a name="IPA-Protocol-Objects"></a>
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<p>
Next: <a href="IPA-Protocol-Commands.html#IPA-Protocol-Commands" accesskey="n" rel="next">IPA Protocol Commands</a>, Up: <a href="In_002dProcess-Agent-Protocol.html#In_002dProcess-Agent-Protocol" accesskey="u" rel="up">In-Process Agent Protocol</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="IPA-Protocol-Objects-1"></a>
<h4 class="subsection">30.1.1 IPA Protocol Objects</h4>
<a name="index-ipa-protocol-objects"></a>

<p>The commands sent to and results received from agent may contain some
complex data types called <em>objects</em>.
</p>
<p>The in-process agent is running on the same machine with <small>GDB</small>
or GDBserver, so it doesn&rsquo;t have to handle as much differences between
two ends as remote protocol (see <a href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>) tries to handle.
However, there are still some differences of two ends in two processes:
</p>
<ol>
<li> word size.  On some 64-bit machines, <small>GDB</small> or GDBserver can be
compiled as a 64-bit executable, while in-process agent is a 32-bit one.
</li><li> ABI.  Some machines may have multiple types of ABI, <small>GDB</small> or
GDBserver is compiled with one, and in-process agent is compiled with
the other one.
</li></ol>

<p>Here are the IPA Protocol Objects:
</p>
<ol>
<li> agent expression object.  It represents an agent expression
(see <a href="Agent-Expressions.html#Agent-Expressions">Agent Expressions</a>).
<a name="agent-expression-object"></a></li><li> tracepoint action object.  It represents a tracepoint action
(see <a href="Tracepoint-Actions.html#Tracepoint-Actions">Tracepoint Action Lists</a>) to collect registers,
memory, static trace data and to evaluate expression.
<a name="tracepoint-action-object"></a></li><li> tracepoint object.  It represents a tracepoint (see <a href="Tracepoints.html#Tracepoints">Tracepoints</a>).
<a name="tracepoint-object"></a>
</li></ol>

<p>The following table describes important attributes of each IPA protocol
object:
</p>
<table>
<thead><tr><th width="30%">Name</th><th width="20%">Size</th><th width="50%">Description</th></tr></thead>
<tr><td width="30%"><em>agent expression object</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">length</td><td width="20%">4</td><td width="50%">length of bytes code</td></tr>
<tr><td width="30%">byte code</td><td width="20%"><var>length</var></td><td width="50%">contents of byte code</td></tr>
<tr><td width="30%"><em>tracepoint action for collecting memory</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">&rsquo;M&rsquo;</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
<tr><td width="30%">addr</td><td width="20%">8</td><td width="50%">if <var>basereg</var> is &lsquo;<samp>-1</samp>&rsquo;, <var>addr</var> is the
address of the lowest byte to collect, otherwise <var>addr</var> is the offset
of <var>basereg</var> for memory collecting.</td></tr>
<tr><td width="30%">len</td><td width="20%">8</td><td width="50%">length of memory for collecting</td></tr>
<tr><td width="30%">basereg</td><td width="20%">4</td><td width="50%">the register number containing the starting
memory address for collecting.</td></tr>
<tr><td width="30%"><em>tracepoint action for collecting registers</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">&rsquo;R&rsquo;</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
<tr><td width="30%"><em>tracepoint action for collecting static trace data</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">&rsquo;L&rsquo;</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
<tr><td width="30%"><em>tracepoint action for expression evaluation</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">&rsquo;X&rsquo;</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
<tr><td width="30%">agent expression</td><td width="20%">length of</td><td width="50%"><a href="#agent-expression-object">agent expression object</a></td></tr>
<tr><td width="30%"><em>tracepoint object</em></td><td width="20%"></td><td width="50%"></td></tr>
<tr><td width="30%">number</td><td width="20%">4</td><td width="50%">number of tracepoint</td></tr>
<tr><td width="30%">address</td><td width="20%">8</td><td width="50%">address of tracepoint inserted on</td></tr>
<tr><td width="30%">type</td><td width="20%">4</td><td width="50%">type of tracepoint</td></tr>
<tr><td width="30%">enabled</td><td width="20%">1</td><td width="50%">enable or disable of tracepoint</td></tr>
<tr><td width="30%">step_count</td><td width="20%">8</td><td width="50%">step</td></tr>
<tr><td width="30%">pass_count</td><td width="20%">8</td><td width="50%">pass</td></tr>
<tr><td width="30%">numactions</td><td width="20%">4</td><td width="50%">number of tracepoint actions</td></tr>
<tr><td width="30%">hit count</td><td width="20%">8</td><td width="50%">hit count</td></tr>
<tr><td width="30%">trace frame usage</td><td width="20%">8</td><td width="50%">trace frame usage</td></tr>
<tr><td width="30%">compiled_cond</td><td width="20%">8</td><td width="50%">compiled condition</td></tr>
<tr><td width="30%">orig_size</td><td width="20%">8</td><td width="50%">orig size</td></tr>
<tr><td width="30%">condition</td><td width="20%">4 if condition is NULL otherwise length of
<a href="#agent-expression-object">agent expression object</a></td><td width="50%">zero if condition is NULL, otherwise is
<a href="#agent-expression-object">agent expression object</a></td></tr>
<tr><td width="30%">actions</td><td width="20%">variable</td><td width="50%">numactions number of <a href="#tracepoint-action-object">tracepoint action object</a></td></tr>
</table>

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<div class="header">
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Next: <a href="IPA-Protocol-Commands.html#IPA-Protocol-Commands" accesskey="n" rel="next">IPA Protocol Commands</a>, Up: <a href="In_002dProcess-Agent-Protocol.html#In_002dProcess-Agent-Protocol" accesskey="u" rel="up">In-Process Agent Protocol</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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