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| <a name="IPA-Protocol-Objects"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="IPA-Protocol-Commands.html#IPA-Protocol-Commands">IPA Protocol Commands</a>, |
| Up: <a rel="up" accesskey="u" href="In_002dProcess-Agent-Protocol.html#In_002dProcess-Agent-Protocol">In-Process Agent Protocol</a> |
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| <h4 class="subsection">30.1.1 IPA Protocol Objects</h4> |
| |
| <p><a name="index-ipa-protocol-objects-3166"></a> |
| The commands sent to and results received from agent may contain some |
| complex data types called <dfn>objects</dfn>. |
| |
| <p>The in-process agent is running on the same machine with <span class="sc">gdb</span> |
| or GDBserver, so it doesn'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: |
| |
| <ol type=1 start=1> |
| <li>word size. On some 64-bit machines, <span class="sc">gdb</span> or GDBserver can be |
| compiled as a 64-bit executable, while in-process agent is a 32-bit one. |
| <li>ABI. Some machines may have multiple types of ABI, <span class="sc">gdb</span> or |
| GDBserver is compiled with one, and in-process agent is compiled with |
| the other one. |
| </ol> |
| |
| <p>Here are the IPA Protocol Objects: |
| |
| <ol type=1 start=1> |
| <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>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>tracepoint object. It represents a tracepoint (see <a href="Tracepoints.html#Tracepoints">Tracepoints</a>). |
| <a name="tracepoint-object"></a> |
| </ol> |
| |
| <p>The following table describes important attributes of each IPA protocol |
| object: |
| |
| <p><table summary=""><tr align="left"><th valign="top" width="30%">Name </th><th valign="top" width="20%">Size </th><th valign="top" width="50%">Description |
| <br></th></tr><tr align="left"><td valign="top" width="30%"><em>agent expression object</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">length </td><td valign="top" width="20%">4 </td><td valign="top" width="50%">length of bytes code |
| <br></td></tr><tr align="left"><td valign="top" width="30%">byte code </td><td valign="top" width="20%"><var>length</var> </td><td valign="top" width="50%">contents of byte code |
| <br></td></tr><tr align="left"><td valign="top" width="30%"><em>tracepoint action for collecting memory</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">'M' </td><td valign="top" width="20%">1 </td><td valign="top" width="50%">type of tracepoint action |
| <br></td></tr><tr align="left"><td valign="top" width="30%">addr </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">if <var>basereg</var> is ‘<samp><span class="samp">-1</span></samp>’, <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. |
| <br></td></tr><tr align="left"><td valign="top" width="30%">len </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">length of memory for collecting |
| <br></td></tr><tr align="left"><td valign="top" width="30%">basereg </td><td valign="top" width="20%">4 </td><td valign="top" width="50%">the register number containing the starting |
| memory address for collecting. |
| <br></td></tr><tr align="left"><td valign="top" width="30%"><em>tracepoint action for collecting registers</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">'R' </td><td valign="top" width="20%">1 </td><td valign="top" width="50%">type of tracepoint action |
| <br></td></tr><tr align="left"><td valign="top" width="30%"><em>tracepoint action for collecting static trace data</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">'L' </td><td valign="top" width="20%">1 </td><td valign="top" width="50%">type of tracepoint action |
| <br></td></tr><tr align="left"><td valign="top" width="30%"><em>tracepoint action for expression evaluation</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">'X' </td><td valign="top" width="20%">1 </td><td valign="top" width="50%">type of tracepoint action |
| <br></td></tr><tr align="left"><td valign="top" width="30%">agent expression </td><td valign="top" width="20%">length of </td><td valign="top" width="50%"><a href="agent-expression-object.html#agent-expression-object">agent expression object</a> |
| <br></td></tr><tr align="left"><td valign="top" width="30%"><em>tracepoint object</em> </td><td valign="top" width="20%"></td><td valign="top" width="50%"> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">number </td><td valign="top" width="20%">4 </td><td valign="top" width="50%">number of tracepoint |
| <br></td></tr><tr align="left"><td valign="top" width="30%">address </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">address of tracepoint inserted on |
| <br></td></tr><tr align="left"><td valign="top" width="30%">type </td><td valign="top" width="20%">4 </td><td valign="top" width="50%">type of tracepoint |
| <br></td></tr><tr align="left"><td valign="top" width="30%">enabled </td><td valign="top" width="20%">1 </td><td valign="top" width="50%">enable or disable of tracepoint |
| <br></td></tr><tr align="left"><td valign="top" width="30%">step_count </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">step |
| <br></td></tr><tr align="left"><td valign="top" width="30%">pass_count </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">pass |
| <br></td></tr><tr align="left"><td valign="top" width="30%">numactions </td><td valign="top" width="20%">4 </td><td valign="top" width="50%">number of tracepoint actions |
| <br></td></tr><tr align="left"><td valign="top" width="30%">hit count </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">hit count |
| <br></td></tr><tr align="left"><td valign="top" width="30%">trace frame usage </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">trace frame usage |
| <br></td></tr><tr align="left"><td valign="top" width="30%">compiled_cond </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">compiled condition |
| <br></td></tr><tr align="left"><td valign="top" width="30%">orig_size </td><td valign="top" width="20%">8 </td><td valign="top" width="50%">orig size |
| <br></td></tr><tr align="left"><td valign="top" width="30%">condition </td><td valign="top" width="20%">4 if condition is NULL otherwise length of |
| <a href="agent-expression-object.html#agent-expression-object">agent expression object</a> |
| </td><td valign="top" width="50%">zero if condition is NULL, otherwise is |
| <a href="agent-expression-object.html#agent-expression-object">agent expression object</a> |
| <br></td></tr><tr align="left"><td valign="top" width="30%">actions </td><td valign="top" width="20%">variable |
| </td><td valign="top" width="50%">numactions number of <a href="tracepoint-action-object.html#tracepoint-action-object">tracepoint action object</a> |
| <br></td></tr></table> |
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