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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Developer Information</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.3" /><meta name="keywords" content=" C++ , library , profile " /><meta name="keywords" content=" ISO C++ , library " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="profile_mode.html" title="Chapter 32. Profile Mode" /><link rel="prev" href="bk01pt12ch32s05.html" title="Implementation Issues" /><link rel="next" href="bk01pt12ch32s07.html" title="Diagnostics" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Developer Information</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk01pt12ch32s05.html">Prev</a> </td><th width="60%" align="center">Chapter 32. Profile Mode</th><td width="20%" align="right"> <a accesskey="n" href="bk01pt12ch32s07.html">Next</a></td></tr></table><hr /></div><div class="sect1" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.ext.profile_mode.developer"></a>Developer Information</h2></div></div></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="manual.ext.profile_mode.developer.bigpic"></a>Big Picture</h3></div></div></div><p>The profile mode headers are included with
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<code class="code">-D_GLIBCXX_PROFILE</code> through preprocessor directives in
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<code class="code">include/std/*</code>.
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</p><p>Instrumented implementations are provided in
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<code class="code">include/profile/*</code>. All instrumentation hooks are macros
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defined in <code class="code">include/profile/profiler.h</code>.
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</p><p>All the implementation of the instrumentation hooks is in
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<code class="code">include/profile/impl/*</code>. Although all the code gets included,
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thus is publicly visible, only a small number of functions are called from
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outside this directory. All calls to hook implementations must be
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done through macros defined in <code class="code">profiler.h</code>. The macro
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must ensure (1) that the call is guarded against reentrance and
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(2) that the call can be turned off at compile time using a
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<code class="code">-D_GLIBCXX_PROFILE_...</code> compiler option.
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</p></div><div class="sect2" lang="en" xml:lang="en"><div class="titlepage"><div><div><h3 class="title"><a id="manual.ext.profile_mode.developer.howto"></a>How To Add A Diagnostic</h3></div></div></div><p>Let's say the diagnostic name is "magic".
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</p><p>If you need to instrument a header not already under
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<code class="code">include/profile/*</code>, first edit the corresponding header
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under <code class="code">include/std/</code> and add a preprocessor directive such
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as the one in <code class="code">include/std/vector</code>:
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</p><pre class="programlisting">
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#ifdef _GLIBCXX_PROFILE
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# include <profile/vector>
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#endif
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</pre><p>
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</p><p>If the file you need to instrument is not yet under
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<code class="code">include/profile/</code>, make a copy of the one in
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<code class="code">include/debug</code>, or the main implementation.
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You'll need to include the main implementation and inherit the classes
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you want to instrument. Then define the methods you want to instrument,
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define the instrumentation hooks and add calls to them.
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Look at <code class="code">include/profile/vector</code> for an example.
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</p><p>Add macros for the instrumentation hooks in
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<code class="code">include/profile/impl/profiler.h</code>.
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Hook names must start with <code class="code">__profcxx_</code>.
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Make sure they transform
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in no code with <code class="code">-D_NO_GLBICXX_PROFILE_MAGIC</code>.
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Make sure all calls to any method in namespace <code class="code">__cxxprof_impl</code>
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is protected against reentrance using macro
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<code class="code">_GLIBCXX_PROFILE_IMPL_REENTRANCE_GUARD</code>.
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All names of methods in namespace <code class="code">__cxxprof_impl</code> called from
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<code class="code">profiler.h</code> must start with <code class="code">__trace_magic_</code>.
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</p><p>Add the implementation of the diagnostic.
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</p><div class="itemizedlist"><ul type="disc"><li><p>
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Create new file <code class="code">include/profile/impl/profiler_magic.h</code>.
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</p></li><li><p>
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Define class <code class="code">__magic_info: public __object_info_base</code>.
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This is the representation of a line in the object table.
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The <code class="code">__merge</code> method is used to aggregate information
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across all dynamic instances created at the same call context.
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The <code class="code">__magnitude</code> must return the estimation of the benefit
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as a number of small operations, e.g., number of words copied.
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The <code class="code">__write</code> method is used to produce the raw trace.
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The <code class="code">__advice</code> method is used to produce the advice string.
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</p></li><li><p>
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Define class <code class="code">__magic_stack_info: public __magic_info</code>.
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This defines the content of a line in the stack table.
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</p></li><li><p>
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Define class <code class="code">__trace_magic: public __trace_base<__magic_info,
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__magic_stack_info></code>.
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It defines the content of the trace associated with this diagnostic.
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</p></li></ul></div><p>
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</p><p>Add initialization and reporting calls in
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<code class="code">include/profile/impl/profiler_trace.h</code>. Use
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<code class="code">__trace_vector_to_list</code> as an example.
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</p><p>Add documentation in file <code class="code">doc/xml/manual/profile_mode.xml</code>.
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</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt12ch32s05.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="profile_mode.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt12ch32s07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Implementation Issues </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Diagnostics</td></tr></table></div></body></html>
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