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First pass at llvm.objectsize documentation.

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Eric Christopher 2009-11-30 08:03:53 +00:00
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@ -291,6 +291,8 @@
'<tt>llvm.trap</tt>' Intrinsic</a></li>
<li><a href="#int_stackprotector">
'<tt>llvm.stackprotector</tt>' Intrinsic</a></li>
<li><a href="#int_objectsize">
'<tt>llvm.objectsize</tt>' Intrinsic</a></li>
</ol>
</li>
</ol>
@ -7246,6 +7248,41 @@ LLVM</a>.</p>
</div>
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<div class="doc_subsubsection">
<a name="int_objectsize">'<tt>llvm.objectsize</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare i32 @llvm.objectsize.i32( i8* &lt;ptr&gt;, i32 &lt;type&gt; )
declare i64 @llvm.objectsize.i64( i8* &lt;ptr&gt;, i32 &lt;type&gt; )
</pre>
<h5>Overview:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic returns the constant number of bytes
from <tt>ptr</tt> to the end of the object <tt>ptr</tt> points to if it
can deduce this at compile time. If there are any side-effects in evaluating
the argument or it cannot deduce which objects <tt>ptr</tt> points to at compile
time the intrinsic returns <tt>(size_t) -1</tt> for <tt>type</tt> 0
or 1 and <tt>(size_t) 0</tt> for <tt>type</tt> 2 or 3.</p>
<h5>Arguments:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic takes two arguments. The first
argument is a pointer to the object <tt>ptr</tt> and an integer <tt>type</tt>.
<tt>type</tt> is an integer ranging from 0 to 3. The lsb corresponds to
a return value based on whole objects, the second bit whether or not we
return the maximum or minimum remaining bytes computed.</p>
<h5>Semantics:</h5>
<p>The <tt>llvm.objectsize</tt> intrinsic is lowered to either a constant
representing the size of the object concerned or <tt>(size_t) -1</tt> if
it cannot be determined at compile time.</p>
</div>
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