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<a name="Current-structure-hierarchy-1"></a>
<h4 class="subsubsection">11.4.2.1 Current structure hierarchy</h4>

<dl compact="compact">
<dt><code>struct tree_decl_minimal</code></dt>
<dd><p>This is the minimal structure to inherit from in order for common
<code>DECL</code> macros to work.  The fields it contains are a unique ID,
source location, context, and name.
</p>
</dd>
<dt><code>struct tree_decl_common</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_minimal</code>.  It
contains fields that most <code>DECL</code> nodes need, such as a field to
store alignment, machine mode, size, and attributes.
</p>
</dd>
<dt><code>struct tree_field_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_common</code>.  It is
used to represent <code>FIELD_DECL</code>.
</p>
</dd>
<dt><code>struct tree_label_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_common</code>.  It is
used to represent <code>LABEL_DECL</code>.
</p>
</dd>
<dt><code>struct tree_translation_unit_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_common</code>.  It is
used to represent <code>TRANSLATION_UNIT_DECL</code>.
</p>
</dd>
<dt><code>struct tree_decl_with_rtl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_common</code>.  It
contains a field to store the low-level RTL associated with a
<code>DECL</code> node.
</p>
</dd>
<dt><code>struct tree_result_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_rtl</code>.  It is
used to represent <code>RESULT_DECL</code>.
</p>
</dd>
<dt><code>struct tree_const_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_rtl</code>.  It is
used to represent <code>CONST_DECL</code>.
</p>
</dd>
<dt><code>struct tree_parm_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_rtl</code>.  It is
used to represent <code>PARM_DECL</code>.
</p>
</dd>
<dt><code>struct tree_decl_with_vis</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_rtl</code>.  It
contains fields necessary to store visibility information, as well as
a section name and assembler name.
</p>
</dd>
<dt><code>struct tree_var_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_vis</code>.  It is
used to represent <code>VAR_DECL</code>.
</p>
</dd>
<dt><code>struct tree_function_decl</code></dt>
<dd><p>This structure inherits from <code>struct tree_decl_with_vis</code>.  It is
used to represent <code>FUNCTION_DECL</code>.
</p>
</dd>
</dl>


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