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<h5 class="subsubsection">10.4.2.1 Current structure hierarchy</h5>
<dl>
<dt><code>struct tree_decl_minimal</code><dd>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.
<br><dt><code>struct tree_decl_common</code><dd>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.
<br><dt><code>struct tree_field_decl</code><dd>This structure inherits from <code>struct tree_decl_common</code>. It is
used to represent <code>FIELD_DECL</code>.
<br><dt><code>struct tree_label_decl</code><dd>This structure inherits from <code>struct tree_decl_common</code>. It is
used to represent <code>LABEL_DECL</code>.
<br><dt><code>struct tree_translation_unit_decl</code><dd>This structure inherits from <code>struct tree_decl_common</code>. It is
used to represent <code>TRANSLATION_UNIT_DECL</code>.
<br><dt><code>struct tree_decl_with_rtl</code><dd>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.
<br><dt><code>struct tree_result_decl</code><dd>This structure inherits from <code>struct tree_decl_with_rtl</code>. It is
used to represent <code>RESULT_DECL</code>.
<br><dt><code>struct tree_const_decl</code><dd>This structure inherits from <code>struct tree_decl_with_rtl</code>. It is
used to represent <code>CONST_DECL</code>.
<br><dt><code>struct tree_parm_decl</code><dd>This structure inherits from <code>struct tree_decl_with_rtl</code>. It is
used to represent <code>PARM_DECL</code>.
<br><dt><code>struct tree_decl_with_vis</code><dd>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.
<br><dt><code>struct tree_var_decl</code><dd>This structure inherits from <code>struct tree_decl_with_vis</code>. It is
used to represent <code>VAR_DECL</code>.
<br><dt><code>struct tree_function_decl</code><dd>This structure inherits from <code>struct tree_decl_with_vis</code>. It is
used to represent <code>FUNCTION_DECL</code>.
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