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+<a name="Function-Properties"></a>
+<div class="header">
+<p>
+Previous: <a href="Function-Basics.html#Function-Basics" accesskey="p" rel="previous">Function Basics</a>, Up: <a href="Functions.html#Functions" accesskey="u" rel="up">Functions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Function-Properties-1"></a>
+<h4 class="subsection">11.8.2 Function Properties</h4>
+<a name="index-function-properties"></a>
+<a name="index-statements"></a>
+
+<p>To determine the scope of a function, you can use the
+<code>DECL_CONTEXT</code> macro.  This macro will return the class
+(either a <code>RECORD_TYPE</code> or a <code>UNION_TYPE</code>) or namespace (a
+<code>NAMESPACE_DECL</code>) of which the function is a member.  For a virtual
+function, this macro returns the class in which the function was
+actually defined, not the base class in which the virtual declaration
+occurred.
+</p>
+<p>In C, the <code>DECL_CONTEXT</code> for a function maybe another function.
+This representation indicates that the GNU nested function extension
+is in use.  For details on the semantics of nested functions, see the
+GCC Manual.  The nested function can refer to local variables in its
+containing function.  Such references are not explicitly marked in the
+tree structure; back ends must look at the <code>DECL_CONTEXT</code> for the
+referenced <code>VAR_DECL</code>.  If the <code>DECL_CONTEXT</code> for the
+referenced <code>VAR_DECL</code> is not the same as the function currently
+being processed, and neither <code>DECL_EXTERNAL</code> nor
+<code>TREE_STATIC</code> hold, then the reference is to a local variable in
+a containing function, and the back end must take appropriate action.
+</p>
+<dl compact="compact">
+<dt><code>DECL_EXTERNAL</code>
+<a name="index-DECL_005fEXTERNAL-1"></a>
+</dt>
+<dd><p>This predicate holds if the function is undefined.
+</p>
+</dd>
+<dt><code>TREE_PUBLIC</code>
+<a name="index-TREE_005fPUBLIC-1"></a>
+</dt>
+<dd><p>This predicate holds if the function has external linkage.
+</p>
+</dd>
+<dt><code>TREE_STATIC</code>
+<a name="index-TREE_005fSTATIC"></a>
+</dt>
+<dd><p>This predicate holds if the function has been defined.
+</p>
+</dd>
+<dt><code>TREE_THIS_VOLATILE</code>
+<a name="index-TREE_005fTHIS_005fVOLATILE"></a>
+</dt>
+<dd><p>This predicate holds if the function does not return normally.
+</p>
+</dd>
+<dt><code>TREE_READONLY</code>
+<a name="index-TREE_005fREADONLY"></a>
+</dt>
+<dd><p>This predicate holds if the function can only read its arguments.
+</p>
+</dd>
+<dt><code>DECL_PURE_P</code>
+<a name="index-DECL_005fPURE_005fP"></a>
+</dt>
+<dd><p>This predicate holds if the function can only read its arguments, but
+may also read global memory.
+</p>
+</dd>
+<dt><code>DECL_VIRTUAL_P</code>
+<a name="index-DECL_005fVIRTUAL_005fP"></a>
+</dt>
+<dd><p>This predicate holds if the function is virtual.
+</p>
+</dd>
+<dt><code>DECL_ARTIFICIAL</code>
+<a name="index-DECL_005fARTIFICIAL-2"></a>
+</dt>
+<dd><p>This macro holds if the function was implicitly generated by the
+compiler, rather than explicitly declared.  In addition to implicitly
+generated class member functions, this macro holds for the special
+functions created to implement static initialization and destruction, to
+compute run-time type information, and so forth.
+</p>
+</dd>
+<dt><code>DECL_FUNCTION_SPECIFIC_TARGET</code>
+<a name="index-DECL_005fFUNCTION_005fSPECIFIC_005fTARGET-1"></a>
+</dt>
+<dd><p>This macro returns a tree node that holds the target options that are
+to be used to compile this particular function or <code>NULL_TREE</code> if
+the function is to be compiled with the target options specified on
+the command line.
+</p>
+</dd>
+<dt><code>DECL_FUNCTION_SPECIFIC_OPTIMIZATION</code>
+<a name="index-DECL_005fFUNCTION_005fSPECIFIC_005fOPTIMIZATION-1"></a>
+</dt>
+<dd><p>This macro returns a tree node that holds the optimization options
+that are to be used to compile this particular function or
+<code>NULL_TREE</code> if the function is to be compiled with the
+optimization options specified on the command line.
+</p>
+</dd>
+</dl>
+
+
+<hr>
+<div class="header">
+<p>
+Previous: <a href="Function-Basics.html#Function-Basics" accesskey="p" rel="previous">Function Basics</a>, Up: <a href="Functions.html#Functions" accesskey="u" rel="up">Functions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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