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Update to explain how ssp and sspreq attributes override each other.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60112 91177308-0d34-0410-b5e6-96231b3b80d8
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Bill Wendling 2008-11-26 19:07:40 +00:00
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@ -992,16 +992,25 @@ throws the same exception) when called with the same set of arguments and global
state.</dd>
<dt><tt><a name="ssp">ssp</a></tt></dt>
<dd>This attribute indicates that the function should emit a stack smashing
<dd><p>This attribute indicates that the function should emit a stack smashing
protector. It is in the form of a "canary"&mdash;a random value placed on the
stack before the local variables that's checked upon return from the function to
see if it has been overwritten. A heuristic is used to determine if a function
needs stack protectors or not.</dd>
needs stack protectors or not.</p>
<dt><tt>ssp-req</tt></dt>
<dd>This attribute indicates that the function should <em>always</em> emit a
<p>If a function that has an <tt>ssp</tt> attribute is inlined into a function
that doesn't have an <tt>ssp</tt> attribute, then the resulting function will
have an <tt>ssp</tt> attribute.</p></dd>
<dt><tt>sspreq</tt></dt>
<dd><p>This attribute indicates that the function should <em>always</em> emit a
stack smashing protector. This overrides the <tt><a href="#ssp">ssp</a></tt>
function attribute.</dd>
function attribute.</p>
<p>If a function that has an <tt>sspreq</tt> attribute is inlined into a
function that doesn't have an <tt>sspreq</tt> attribute or which has
an <tt>ssp</tt> attribute, then the resulting function will have
an <tt>sspreq</tt> attribute.</p></dd>
</dl>
</div>