<h5>Syntax:</h5>
<pre>
- declare i32 @llvm.objectsize.i32( i8* <ptr>, i32 <type> )
- declare i64 @llvm.objectsize.i64( i8* <ptr>, i32 <type> )
+ declare i32 @llvm.objectsize.i32( i8* <object>, i1 <type> )
+ declare i64 @llvm.objectsize.i64( i8* <object>, i1 <type> )
</pre>
<h5>Overview:</h5>
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>