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[LangRef] Add description for nocallback attribute

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This patch adds the description for nocallback attribute
that is implemented in https://reviews.llvm.org/D90275.

Differential Revision: https://reviews.llvm.org/D131628
This commit is contained in:
Gulfem Savrun Yeniceri 2022-08-10 22:40:23 +00:00
parent b95689933f
commit 70792cd4f8
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llvm/docs/LangRef.rst
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@ -1805,6 +1805,13 @@ example:
with equivalent code based on the semantics of the built-in function, unless
the call site uses the ``builtin`` attribute. This is valid at call sites
and on function declarations and definitions.
``nocallback``
This attribute indicates that the function is only allowed to jump back into
caller's module by a return or an exception, and is not allowed to jump back
by invoking a callback function, a direct, possibly transitive, external
function call, use of ``longjmp``, or other means. It is a compiler hint that
is used at module level to improve dataflow analysis, dropped during linking,
and has no effect on functions defined in the current module.
``noduplicate``
This attribute indicates that calls to the function cannot be
duplicated. A call to a ``noduplicate`` function may be moved