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Update docs for ssp and sspreq function attributes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59203 91177308-0d34-0410-b5e6-96231b3b80d8
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Bill Wendling 2008-11-13 01:02:51 +00:00
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@ -985,6 +985,18 @@ caller functions. It may dereference pointer arguments and read state that may
be set in the caller. A readonly function always returns the same value (or be set in the caller. A readonly function always returns the same value (or
throws the same exception) when called with the same set of arguments and global throws the same exception) when called with the same set of arguments and global
state.</dd> state.</dd>
<dt><tt><a name="ssp">ssp</a></tt></dt>
<dd>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>
<dt><tt>ssp-req</tt></dt>
<dd>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>
</dl> </dl>
</div> </div>