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Update docs for bitcode changes. For object size checking we won't

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work with partial objects so just count the type as a boolean. Update
appropriately.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91954 91177308-0d34-0410-b5e6-96231b3b80d8
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Eric Christopher 2009-12-23 00:29:49 +00:00
parent 775db97a50
commit 8295a0a991
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@ -7257,8 +7257,8 @@ LLVM</a>.</p>
<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; )
declare i32 @llvm.objectsize.i32( i8* &lt;object&gt;, i1 &lt;type&gt; )
declare i64 @llvm.objectsize.i64( i8* &lt;object&gt;, i1 &lt;type&gt; )
</pre>
<h5>Overview:</h5>
@ -7267,34 +7267,15 @@ LLVM</a>.</p>
operation like memcpy will either overflow a buffer that corresponds to
an object, or b) to determine that a runtime check for overflow isn't
necessary. An object in this context means an allocation of a
specific <a href="#typesystem">type</a>.</p>
specific class, structure, array, or other object.</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>. The second argument
is an integer <tt>type</tt> which ranges from 0 to 3. The first bit in
the type corresponds to a return value based on whole objects,
and the second bit whether or not we return the maximum or minimum
remaining bytes computed.</p>
<table class="layout">
<tr class="layout">
<td class="left"><tt>00</tt></td>
<td class="left">whole object, maximum number of bytes</td>
</tr>
<tr class="layout">
<td class="left"><tt>01</tt></td>
<td class="left">partial object, maximum number of bytes</td>
</tr>
<tr class="layout">
<td class="left"><tt>10</tt></td>
<td class="left">whole object, minimum number of bytes</td>
</tr>
<tr class="layout">
<td class="left"><tt>11</tt></td>
<td class="left">partial object, minimum number of bytes</td>
</tr>
</table>
argument is a pointer to or into the <tt>object</tt>. The second argument
is a boolean 0 or 1. This argument determines whether you want the
maximum (0) or minimum (1) bytes remaining. This needs to be a literal 0 or
1, variables are not allowed.</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>i32/i64 -1 or 0</tt>