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  <div class="section" id="gcc-xml-0-7-0-9-upgrade-issues-legacy">
<h1>GCC-XML 0.7 → 0.9 upgrade issues (Legacy)<a class="headerlink" href="#gcc-xml-0-7-0-9-upgrade-issues-legacy" title="Permalink to this headline"></a></h1>
<div class="section" id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline"></a></h2>
<p>This page is kept here for historical reasons. CastXML is the recommended
xml generator and GCC-XML is being phased out. This page will be removed
in version 2.0.0 of pygcxml.</p>
<p>Recently, GCC-XML internal parser was updated to GCC 4.2. The internal representation
of source code, provided by GCC&#8217;s parser, has changed a lot and few backward
compatibility issues were introduced. In this document, I will try to cover all
problems you may encounter.</p>
</div>
<div class="section" id="default-constructor">
<h2>Default constructor<a class="headerlink" href="#default-constructor" title="Permalink to this headline"></a></h2>
<p>GCC-XML 0.9 doesn&#8217;t report compiler generated default and copy constructors as
an implicit ones.</p>
<p>If you rely heavily on their existence in the generated XML, I suggest you to switch
to <code class="xref py py-func docutils literal"><span class="pre">has_trivial_constructor</span></code>
and to <code class="xref py py-func docutils literal"><span class="pre">has_trivial_copy</span></code> functions.</p>
</div>
<div class="section" id="pointer-to-member-variable">
<h2>Pointer to member variable<a class="headerlink" href="#pointer-to-member-variable" title="Permalink to this headline"></a></h2>
<p>Previous version of GCC-XML reported pointer to member variable as a &#8220;PointerType&#8221;
with reference to &#8220;OffsetType&#8221;. The new version removes &#8220;PointerType&#8221; from this sequence.</p>
<p>C++ code:</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="k">struct</span> <span class="n">xyz_t</span><span class="p">{</span>
  <span class="kt">int</span> <span class="n">do_smth</span><span class="p">(</span> <span class="kt">double</span> <span class="p">);</span>
  <span class="kt">int</span> <span class="n">m_some_member</span><span class="p">;</span>
<span class="p">};</span>

<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="n">xyz_t</span><span class="o">::*</span><span class="n">mfun_ptr_t</span><span class="p">)(</span> <span class="kt">double</span> <span class="p">);</span>

<span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="n">xyz_t</span><span class="o">::*</span><span class="n">mvar_ptr_t</span><span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7:</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Typedef</span> <span class="na">id=</span><span class="s">&quot;_6&quot;</span> <span class="na">name=</span><span class="s">&quot;mfun_ptr_t&quot;</span> <span class="na">type=</span><span class="s">&quot;_5&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;PointerType</span> <span class="na">id=</span><span class="s">&quot;_5&quot;</span> <span class="na">type=</span><span class="s">&quot;_128&quot;</span> <span class="na">size=</span><span class="s">&quot;32&quot;</span> <span class="na">align=</span><span class="s">&quot;32&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;MethodType</span> <span class="na">id=</span><span class="s">&quot;_128&quot;</span> <span class="na">basetype=</span><span class="s">&quot;_7&quot;</span> <span class="na">returns=</span><span class="s">&quot;_136&quot;</span><span class="nt">&gt;</span>
  <span class="nt">&lt;Argument</span> <span class="na">type=</span><span class="s">&quot;_140&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/MethodType&gt;</span>

<span class="nt">&lt;Typedef</span> <span class="na">id=</span><span class="s">&quot;_4&quot;</span> <span class="na">name=</span><span class="s">&quot;mvar_ptr_t&quot;</span> <span class="na">type=</span><span class="s">&quot;_3&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;PointerType</span> <span class="na">id=</span><span class="s">&quot;_3&quot;</span> <span class="na">type=</span><span class="s">&quot;_127&quot;</span> <span class="na">size=</span><span class="s">&quot;32&quot;</span> <span class="na">align=</span><span class="s">&quot;32&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;OffsetType</span> <span class="na">id=</span><span class="s">&quot;_127&quot;</span> <span class="na">basetype=</span><span class="s">&quot;_7&quot;</span> <span class="na">type=</span><span class="s">&quot;_136&quot;</span> <span class="na">size=</span><span class="s">&quot;32&quot;</span> <span class="na">align=</span><span class="s">&quot;32&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9:</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Typedef</span> <span class="na">id=</span><span class="s">&quot;_97&quot;</span> <span class="na">name=</span><span class="s">&quot;mfun_ptr_t&quot;</span> <span class="na">type=</span><span class="s">&quot;_96&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;PointerType</span> <span class="na">id=</span><span class="s">&quot;_96&quot;</span> <span class="na">type=</span><span class="s">&quot;_147&quot;</span> <span class="na">size=</span><span class="s">&quot;32&quot;</span> <span class="na">align=</span><span class="s">&quot;32&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;MethodType</span> <span class="na">id=</span><span class="s">&quot;_147&quot;</span> <span class="na">basetype=</span><span class="s">&quot;_92&quot;</span> <span class="na">returns=</span><span class="s">&quot;_131&quot;</span><span class="nt">&gt;</span>
  <span class="nt">&lt;Argument</span> <span class="na">type=</span><span class="s">&quot;_127&quot;</span><span class="nt">/&gt;</span>
<span class="nt">&lt;/MethodType&gt;</span>

<span class="nt">&lt;Typedef</span> <span class="na">id=</span><span class="s">&quot;_52&quot;</span> <span class="na">name=</span><span class="s">&quot;mvar_ptr_t&quot;</span> <span class="na">type=</span><span class="s">&quot;_139&quot;</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;OffsetType</span> <span class="na">id=</span><span class="s">&quot;_139&quot;</span> <span class="na">basetype=</span><span class="s">&quot;_92&quot;</span> <span class="na">type=</span><span class="s">&quot;_131&quot;</span> <span class="na">size=</span><span class="s">&quot;32&quot;</span> <span class="na">align=</span><span class="s">&quot;32&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>pygccxml handles this issue automatically, you don&#8217;t have to change your code.</p>
</div>
<div class="section" id="constant-variable-value">
<h2>Constant variable value<a class="headerlink" href="#constant-variable-value" title="Permalink to this headline"></a></h2>
<p>GCC-XML 0.9 uses suffix to report the constant variable value</p>
<p>For example:</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="k">const</span> <span class="kt">long</span> <span class="kt">unsigned</span> <span class="kt">int</span> <span class="n">initialized</span> <span class="o">=</span> <span class="mi">10122004</span><span class="p">;</span>
</pre></div>
</div>
<p>GCC-XML 0.9 will report the <code class="docutils literal"><span class="pre">initialized</span></code> value as <code class="docutils literal"><span class="pre">10122004ul</span></code>, while GCC-XML
0.7 as <code class="docutils literal"><span class="pre">10122004</span></code>.</p>
<p>pygccxml handles  this problem automatically, you don&#8217;t have to change your code.</p>
</div>
<div class="section" id="free-and-member-function-default-arguments">
<h2>Free and member function default arguments<a class="headerlink" href="#free-and-member-function-default-arguments" title="Permalink to this headline"></a></h2>
<p>Both versions of GCC-XML have a few issues, related to default arguments. GCC-XML 0.9
fixes some issues, but introduces another ones. Take a look on the following examples:</p>
<ul>
<li><p class="first">Example 1</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">fix_numeric</span><span class="p">(</span> <span class="n">ull</span> <span class="n">arg</span><span class="o">=</span><span class="p">(</span><span class="n">ull</span><span class="p">)</span><span class="o">-</span><span class="mi">1</span> <span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;arg&quot;</span> <span class="na">type=</span><span class="s">&quot;_7&quot;</span> <span class="na">default=</span><span class="s">&quot;0xffffffffffffffff&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;arg&quot;</span> <span class="na">type=</span><span class="s">&quot;_103&quot;</span> <span class="na">default=</span><span class="s">&quot;0xffffffffffffffffu&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
</li>
<li><p class="first">Example 2</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">fix_function_call</span><span class="p">(</span> <span class="kt">int</span> <span class="n">i</span><span class="o">=</span><span class="n">calc</span><span class="p">(</span> <span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span> <span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;i&quot;</span> <span class="na">type=</span><span class="s">&quot;_9&quot;</span> <span class="na">default=</span><span class="s">&quot;function_call::calc(int, int, int)(1, 2, 3)&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;i&quot;</span> <span class="na">type=</span><span class="s">&quot;_34&quot;</span> <span class="na">default=</span><span class="s">&quot;function_call::calc(1, 2, 3)&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
</li>
<li><p class="first">Example 3</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">typedef__func</span><span class="p">(</span> <span class="k">const</span> <span class="n">typedef_</span><span class="o">::</span><span class="n">alias</span><span class="o">&amp;</span> <span class="n">position</span> <span class="o">=</span> <span class="n">typedef_</span><span class="o">::</span><span class="n">alias</span><span class="p">()</span> <span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;position&quot;</span> <span class="na">type=</span><span class="s">&quot;_1458&quot;</span> <span class="na">default=</span><span class="s">&quot;alias()&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;position&quot;</span> <span class="na">type=</span><span class="s">&quot;_1703&quot;</span> <span class="na">default=</span><span class="s">&quot;typedef_::original_name()&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
</li>
<li><p class="first">Example 4</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="kt">void</span> <span class="nf">typedef__func2</span><span class="p">(</span> <span class="k">const</span> <span class="n">typedef_</span><span class="o">::</span><span class="n">alias</span><span class="o">&amp;</span> <span class="n">position</span> <span class="o">=</span> <span class="n">alias</span><span class="p">()</span> <span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;position&quot;</span> <span class="na">type=</span><span class="s">&quot;_1458&quot;</span> <span class="na">default=</span><span class="s">&quot;alias()&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;position&quot;</span> <span class="na">type=</span><span class="s">&quot;_1703&quot;</span> <span class="na">default=</span><span class="s">&quot;typedef_::original_name()&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
</li>
<li><p class="first">Example 5</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="n">node</span><span class="o">*</span> <span class="nf">clone_tree</span><span class="p">(</span> <span class="k">const</span> <span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&gt;</span> <span class="o">&amp;</span><span class="n">types</span><span class="o">=</span><span class="n">std</span><span class="o">::</span><span class="n">vector</span><span class="o">&lt;</span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="o">&gt;</span><span class="p">()</span> <span class="p">);</span>
</pre></div>
</div>
<p>GCC-XML 0.7</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;types&quot;</span> <span class="na">type=</span><span class="s">&quot;_3336&quot;</span> <span class="na">default=</span><span class="s">&quot;vector&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;,std::allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt; &amp;gt;((&amp;amp;allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt;()))&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
<p>GCC-XML 0.9</p>
<div class="highlight-xml"><div class="highlight"><pre><span></span><span class="nt">&lt;Argument</span> <span class="na">name=</span><span class="s">&quot;types&quot;</span> <span class="na">type=</span><span class="s">&quot;_3096&quot;</span> <span class="na">default=</span><span class="s">&quot;std::vector&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt;, std::allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt; &amp;gt;(((const std::allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt;&amp;amp;)((const std::allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt;*)(&amp;amp; std::allocator&amp;lt;std::basic_string&amp;lt;char, std::char_traits&amp;lt;char&amp;gt;, std::allocator&amp;lt;char&amp;gt; &amp;gt; &amp;gt;()))))&quot;</span><span class="nt">/&gt;</span>
</pre></div>
</div>
</li>
</ul>
<p>Basically pygccxml can&#8217;t help you here. The good news is that you always can
change the default value expression from the script:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="c1">#f is &quot;calldef_t&quot; instance</span>
<span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">f</span><span class="o">.</span><span class="n">arguments</span><span class="p">:</span>
    <span class="n">arg</span><span class="o">.</span><span class="n">default_value</span> <span class="o">=</span> <span class="o">&lt;&lt;&lt;</span><span class="n">new</span> <span class="n">default</span> <span class="n">value</span> <span class="ow">or</span> <span class="bp">None</span><span class="o">&gt;&gt;&gt;</span>
</pre></div>
</div>
</div>
<div class="section" id="name-mangling">
<h2>Name mangling<a class="headerlink" href="#name-mangling" title="Permalink to this headline"></a></h2>
<p>GCC-XML 0.9 mangles names different than the previous one. This change is the most
dramatic one, because it may require from you to change the code.</p>
<p>Consider the following C++ code:</p>
<div class="highlight-c++"><div class="highlight"><pre><span></span><span class="k">template</span><span class="o">&lt;</span> <span class="kt">unsigned</span> <span class="kt">long</span> <span class="n">i1</span><span class="o">&gt;</span>
<span class="k">struct</span> <span class="n">item_t</span><span class="p">{</span>
  <span class="k">static</span> <span class="k">const</span> <span class="kt">unsigned</span> <span class="kt">long</span> <span class="n">v1</span> <span class="o">=</span> <span class="n">i1</span><span class="p">;</span>
<span class="p">};</span>

<span class="k">struct</span> <span class="n">buggy</span><span class="p">{</span>
  <span class="k">typedef</span> <span class="kt">unsigned</span> <span class="kt">long</span> <span class="n">ulong</span><span class="p">;</span>
  <span class="k">typedef</span> <span class="n">item_t</span><span class="o">&lt;</span> <span class="n">ulong</span><span class="p">(</span> <span class="mh">0xDEECE66DUL</span> <span class="p">)</span> <span class="o">|</span> <span class="p">(</span><span class="n">ulong</span><span class="p">(</span><span class="mh">0x5</span><span class="p">)</span> <span class="o">&lt;&lt;</span> <span class="mi">32</span><span class="p">)</span> <span class="o">&gt;</span> <span class="n">my_item_t</span><span class="p">;</span>
  <span class="n">my_item_t</span> <span class="n">my_item_var</span><span class="p">;</span>
<span class="p">};</span>
</pre></div>
</div>
<table border="1" class="docutils">
<colgroup>
<col width="31%" />
<col width="34%" />
<col width="35%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">generated data</th>
<th class="head">GCC-XML 0.7</th>
<th class="head">GCC-XML 0.9</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td>class name</td>
<td>item_t&lt;0x0deece66d&gt;</td>
<td>item_t&lt;-554899859ul&gt;</td>
</tr>
<tr class="row-odd"><td>class mangled name</td>
<td>6item_tILm3740067437EE</td>
<td>6item_tILm3740067437EE</td>
</tr>
<tr class="row-even"><td>class demangled name</td>
<td>item_t&lt;3740067437l&gt;</td>
<td>item_t&lt;3740067437ul&gt;</td>
</tr>
</tbody>
</table>
<p>pygccxml uses class demangled name as a &#8220;name&#8221; of the class. This was done to
overcome few bugs GCC-XML has, when it works on libraries with extreme usage of
templates.</p>
<p>As you can see the name of the class is different. pygccxml is unable to help
you in such situations. I suggest you to use query API strict mode. This is the
default one. If the class/declaration with the given name could not be found, it
will raise an error with clear description of the problem.</p>
<p>You can also to print the declarations tree to <code class="docutils literal"><span class="pre">stdout</span></code> and find out the name
of the class/declaration from it.</p>
</div>
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