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  <div class="section" id="id1">
<h1>0.10<a class="headerlink" href="#id1" title="Permalink to this headline"></a></h1>
<p>Thanks to Buck Golemon, Daniele Varrazzo, David Narvaez, Eevee, Jason Mueller,
Kevin Pyle, Matt Rice and Tom Tromey for their contributions to this release.</p>
<div class="section" id="changes-to-the-gcc-python-plugin">
<h2>Changes to the GCC Python Plugin<a class="headerlink" href="#changes-to-the-gcc-python-plugin" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li>The plugin can now be used with Python 3.3 (fixing Unicode issues and
dict-ordering assumptions).</li>
<li>The plugin now exposes inline assembler to Python scripts via
<a class="reference internal" href="gimple.html#gcc.GimpleAsm" title="gcc.GimpleAsm"><code class="xref py py-class docutils literal"><span class="pre">gcc.GimpleAsm</span></code></a>.</li>
<li>There is a new <cite>gccutils.sorted_callgraph()</cite> function to get the callgraph in
topologically-sorted order.</li>
<li>The test suite has been reworked to fix issues with checkouts on OS X
case-insensitive filesystems.</li>
<li>C++ support: support for locating the global namespace (aka &#8221;::&#8221;), for locating
declarations and child namespaces within a namespace, and aliases.</li>
<li><a class="reference internal" href="tree.html#gcc.Declaration" title="gcc.Declaration"><code class="xref py py-class docutils literal"><span class="pre">gcc.Declaration</span></code></a> now has an is_builtin attribute</li>
<li>Numerous improvements to the plugin&#8217;s Makefile</li>
</ul>
</div>
<div class="section" id="improvements-to-gcc-with-cpychecker">
<h2>Improvements to <a class="reference internal" href="cpychecker.html"><span class="doc">gcc-with-cpychecker</span></a><a class="headerlink" href="#improvements-to-gcc-with-cpychecker" title="Permalink to this headline"></a></h2>
<ul>
<li><p class="first">By default, the refcount checker is now only run on code that includes
&lt;Python.h&gt; (implemented by checking if the &#8220;PyObject&#8221; typedef exists).</p>
<p>This greatly speeds up compilation of large projects for which the Python
extension modules are only a small subset of the source tree.</p>
</li>
<li><p class="first">Added some custom attributes for marking functions that set an exception,
either always, or when returning a negative value:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">__attribute__</span><span class="p">((</span><span class="n">cpychecker_negative_result_sets_exception</span><span class="p">))</span>
<span class="n">__attribute__</span><span class="p">((</span><span class="n">cpychecker_sets_exception</span><span class="p">))</span>
</pre></div>
</div>
</li>
<li><p class="first">Improve descriptions of ranges: rather than emitting descriptions with the rather
vague &#8220;value&#8221;, such as:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">when</span> <span class="n">considering</span> <span class="nb">range</span><span class="p">:</span> <span class="mi">1</span> <span class="o">&lt;=</span> <span class="n">value</span> <span class="o">&lt;=</span> <span class="mh">0x7fffffff</span>
</pre></div>
</div>
<p>instead try to embed a descriptive name for the value, such as:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">when</span> <span class="n">considering</span> <span class="nb">range</span><span class="p">:</span> <span class="mi">1</span> <span class="o">&lt;=</span> <span class="n">n</span> <span class="o">&lt;=</span> <span class="mh">0x7fffffff</span>
</pre></div>
</div>
</li>
</ul>
<div class="section" id="mass-recompile-of-fedora-17-s-python-extension-code">
<h3>Mass recompile of Fedora 17&#8217;s Python extension code<a class="headerlink" href="#mass-recompile-of-fedora-17-s-python-extension-code" title="Permalink to this headline"></a></h3>
<p>I ran the reference-count checker on all of the C/C++ Python extension modules
in Fedora 17 and <a class="reference external" href="http://fedoraproject.org/wiki/Features/StaticAnalysisOfPythonRefcounts">reported hundreds of genuine problems</a>,
many of which have been fixed.</p>
<p>In the process of doing this I found and fixed many problems in the checker
itself.  For example:</p>
<blockquote>
<div><ul>
<li><p class="first">the checker now understand&#8217;s GCC&#8217;s  <cite>__builtin_expect</cite>, fixing various
false reports about dereferencing NULL pointers when running the checker
on Cython-generated code in python-lxml-2.3</p>
</li>
<li><p class="first">added descriptions of part of SWIG and Cython&#8217;s internal APIs to suppress
some false positives seen with SWIG and Cython-generated code.</p>
</li>
<li><p class="first">tweak the refcount rules to fix some false positives where the checker
erroneously considered the case of a deallocation by:</p>
<div class="highlight-c"><div class="highlight"><pre><span></span><span class="n">Py_DECREF</span><span class="p">(</span><span class="n">obj</span><span class="p">);</span>
</pre></div>
</div>
<p>where &#8220;obj&#8221; provably had other references not owned by the function being
analyzed, and thus for the case where obj-&gt;ob_refcnt &gt; 1 the deallocation
could not happen.</p>
</li>
</ul>
</div></blockquote>
<p>The plugin also now has a triaging script which can examine all of the errors
within a build and provide a report, showing all of them in prioritized
categories.</p>
<p>The source tree now contains helper scripts for conducting such a mass recompile.</p>
</div>
<div class="section" id="pyscopg-support">
<h3>Pyscopg support<a class="headerlink" href="#pyscopg-support" title="Permalink to this headline"></a></h3>
<p>Daniele Varrazzo used the checker extensively on
<a class="reference external" href="http://initd.org/psycopg/">psycopg</a>, the popular Python interface
to <a class="reference external" href="http://www.postgresql.org/">PostgreSQL</a>, and was able to find and fix
numerous subtle errors:</p>
<blockquote>
<div><ul class="simple">
<li><a class="reference external" href="https://fedorahosted.org/pipermail/gcc-python-plugin/2012-March/000229.html">https://fedorahosted.org/pipermail/gcc-python-plugin/2012-March/000229.html</a></li>
<li><a class="reference external" href="http://initd.org/psycopg/articles/2012/03/29/psycopg-245-released/">http://initd.org/psycopg/articles/2012/03/29/psycopg-245-released/</a></li>
</ul>
</div></blockquote>
</div>
<div class="section" id="experimental-new-error-visualization">
<h3>Experimental new error visualization<a class="headerlink" href="#experimental-new-error-visualization" title="Permalink to this headline"></a></h3>
<p>The checker can now dump its internal representation in JSON form, via a new
<cite>&#8211;dump-json</cite> option, and an experimental new renderer can generate HTML from
this.  An example can be seen here:</p>
<p><a class="reference external" href="http://fedorapeople.org/~dmalcolm/gcc-python-plugin/2012-03-19/example/example.html">http://fedorapeople.org/~dmalcolm/gcc-python-plugin/2012-03-19/example/example.html</a></p>
<p>This is still a work-in-progress</p>
</div>
<div class="section" id="c-support">
<h3>C++ support<a class="headerlink" href="#c-support" title="Permalink to this headline"></a></h3>
<p>The checker is now able to run on C++ code: support has been added for methods,
references, &#8220;this&#8221;, destructors, the <a class="reference internal" href="gimple.html#gcc.GimpleNop" title="gcc.GimpleNop"><code class="xref py py-class docutils literal"><span class="pre">gcc.GimpleNop</span></code></a> operation.</p>
</div>
<div class="section" id="coverage-of-the-cpython-api">
<h3>Coverage of the CPython API<a class="headerlink" href="#coverage-of-the-cpython-api" title="Permalink to this headline"></a></h3>
<p>The format code handling for Py_BuildValue was missing support for the
following codes:</p>
<blockquote>
<div><ul class="simple">
<li>&#8216;u&#8217; and &#8216;u#&#8217;</li>
<li>&#8216;f&#8217; and &#8216;d&#8217;</li>
<li>&#8216;D&#8217;</li>
<li>&#8216;c&#8217;</li>
</ul>
</div></blockquote>
<p>In addition, the handling for &#8216;s#&#8217; and &#8216;z#&#8217; had a bug in which it erroneously
expected an int* or Py_ssize_t*, rather than just a int or Py_ssize_t.</p>
<p>This release fixes these issues, and gives full coverage of all valid
format codes for Py_BuildValue in Python 2.</p>
<p>This release adds heuristics for the behavior of the following CPython API
entrypoints:</p>
<blockquote>
<div><ul class="simple">
<li>PyCode_New</li>
<li>PyCObject_FromVoidPtrAndDesc</li>
<li>PyDict_Size</li>
<li>PyErr_Clear</li>
<li>PyEval_CallMethod</li>
<li>Py_FatalError</li>
<li>PyFile_SoftSpace, PyFile_WriteObject, and PyFile_WriteString</li>
<li>PyFloat_AsDouble and PyFloat_FromDouble</li>
<li>PyFrame_New</li>
<li>Py_GetVersion</li>
<li>PyImport_AddModule</li>
<li>PyIter_Next</li>
<li>PyNumber_Int, PyNumber_Remainder</li>
<li>PyObject_CallObject, PyObject_GetAttr, PyObject_GetAttrString, PyObject_GetItem, PyObject_SetAttr, and PyObject_SetAttrString</li>
<li>PyOS_snprintf</li>
<li>PyString_InternFromString</li>
<li>PySequence_Concat, PySequence_GetSlice, PySequence_SetItem, PySequence_Size</li>
<li>PySys_GetObject</li>
<li>PyTraceBack_Here</li>
<li>PyTuple_GetItem</li>
<li>PyUnicodeUCS4_DecodeUTF8</li>
<li>PyWeakref_GetObject</li>
</ul>
</div></blockquote>
<p>along with various other bugfixes.</p>
</div>
</div>
</div>


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  <h3><a href="index.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">0.10</a><ul>
<li><a class="reference internal" href="#changes-to-the-gcc-python-plugin">Changes to the GCC Python Plugin</a></li>
<li><a class="reference internal" href="#improvements-to-gcc-with-cpychecker">Improvements to <code class="docutils literal"><span class="pre">gcc-with-cpychecker</span></code></a><ul>
<li><a class="reference internal" href="#mass-recompile-of-fedora-17-s-python-extension-code">Mass recompile of Fedora 17&#8217;s Python extension code</a></li>
<li><a class="reference internal" href="#pyscopg-support">Pyscopg support</a></li>
<li><a class="reference internal" href="#experimental-new-error-visualization">Experimental new error visualization</a></li>
<li><a class="reference internal" href="#c-support">C++ support</a></li>
<li><a class="reference internal" href="#coverage-of-the-cpython-api">Coverage of the CPython API</a></li>
</ul>
</li>
</ul>
</li>
</ul>

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