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<title>Debugging with GDB: IPA Protocol Objects</title>
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<a name="IPA-Protocol-Objects"></a>
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<div class="header">
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<p>
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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> [<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>
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<a name="IPA-Protocol-Objects-1"></a>
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<h4 class="subsection">30.1.1 IPA Protocol Objects</h4>
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<a name="index-ipa-protocol-objects"></a>
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<p>The commands sent to and results received from agent may contain some
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complex data types called <em>objects</em>.
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</p>
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<p>The in-process agent is running on the same machine with <small>GDB</small>
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or GDBserver, so it doesn’t have to handle as much differences between
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two ends as remote protocol (see <a href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>) tries to handle.
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However, there are still some differences of two ends in two processes:
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</p>
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<ol>
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<li> word size. On some 64-bit machines, <small>GDB</small> or GDBserver can be
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compiled as a 64-bit executable, while in-process agent is a 32-bit one.
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</li><li> ABI. Some machines may have multiple types of ABI, <small>GDB</small> or
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GDBserver is compiled with one, and in-process agent is compiled with
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the other one.
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</li></ol>
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<p>Here are the IPA Protocol Objects:
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</p>
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<ol>
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<li> agent expression object. It represents an agent expression
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(see <a href="Agent-Expressions.html#Agent-Expressions">Agent Expressions</a>).
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<a name="agent-expression-object"></a></li><li> tracepoint action object. It represents a tracepoint action
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(see <a href="Tracepoint-Actions.html#Tracepoint-Actions">Tracepoint Action Lists</a>) to collect registers,
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memory, static trace data and to evaluate expression.
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<a name="tracepoint-action-object"></a></li><li> tracepoint object. It represents a tracepoint (see <a href="Tracepoints.html#Tracepoints">Tracepoints</a>).
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<a name="tracepoint-object"></a>
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</li></ol>
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<p>The following table describes important attributes of each IPA protocol
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object:
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</p>
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<table>
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<thead><tr><th width="30%">Name</th><th width="20%">Size</th><th width="50%">Description</th></tr></thead>
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<tr><td width="30%"><em>agent expression object</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">length</td><td width="20%">4</td><td width="50%">length of bytes code</td></tr>
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<tr><td width="30%">byte code</td><td width="20%"><var>length</var></td><td width="50%">contents of byte code</td></tr>
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<tr><td width="30%"><em>tracepoint action for collecting memory</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">’M’</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
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<tr><td width="30%">addr</td><td width="20%">8</td><td width="50%">if <var>basereg</var> is ‘<samp>-1</samp>’, <var>addr</var> is the
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address of the lowest byte to collect, otherwise <var>addr</var> is the offset
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of <var>basereg</var> for memory collecting.</td></tr>
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<tr><td width="30%">len</td><td width="20%">8</td><td width="50%">length of memory for collecting</td></tr>
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<tr><td width="30%">basereg</td><td width="20%">4</td><td width="50%">the register number containing the starting
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memory address for collecting.</td></tr>
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<tr><td width="30%"><em>tracepoint action for collecting registers</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">’R’</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
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<tr><td width="30%"><em>tracepoint action for collecting static trace data</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">’L’</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
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<tr><td width="30%"><em>tracepoint action for expression evaluation</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">’X’</td><td width="20%">1</td><td width="50%">type of tracepoint action</td></tr>
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<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>
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<tr><td width="30%"><em>tracepoint object</em></td><td width="20%"></td><td width="50%"></td></tr>
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<tr><td width="30%">number</td><td width="20%">4</td><td width="50%">number of tracepoint</td></tr>
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<tr><td width="30%">address</td><td width="20%">8</td><td width="50%">address of tracepoint inserted on</td></tr>
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<tr><td width="30%">type</td><td width="20%">4</td><td width="50%">type of tracepoint</td></tr>
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<tr><td width="30%">enabled</td><td width="20%">1</td><td width="50%">enable or disable of tracepoint</td></tr>
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<tr><td width="30%">step_count</td><td width="20%">8</td><td width="50%">step</td></tr>
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<tr><td width="30%">pass_count</td><td width="20%">8</td><td width="50%">pass</td></tr>
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<tr><td width="30%">numactions</td><td width="20%">4</td><td width="50%">number of tracepoint actions</td></tr>
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<tr><td width="30%">hit count</td><td width="20%">8</td><td width="50%">hit count</td></tr>
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<tr><td width="30%">trace frame usage</td><td width="20%">8</td><td width="50%">trace frame usage</td></tr>
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<tr><td width="30%">compiled_cond</td><td width="20%">8</td><td width="50%">compiled condition</td></tr>
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<tr><td width="30%">orig_size</td><td width="20%">8</td><td width="50%">orig size</td></tr>
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<tr><td width="30%">condition</td><td width="20%">4 if condition is NULL otherwise length of
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<a href="#agent-expression-object">agent expression object</a></td><td width="50%">zero if condition is NULL, otherwise is
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<a href="#agent-expression-object">agent expression object</a></td></tr>
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<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>
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</table>
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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> [<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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