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Make MDNode use CallbackVH. Also change MDNode to store Value* instead of

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Constant* in preperation of a future change to support holding non-Constants
in an MDNode.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71407 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-05-10 20:57:05 +00:00
parent af3fdb5dc4
commit cb33799b9f
12 changed files with 270 additions and 105 deletions
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docs/LangRef.html
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@@ -2061,6 +2061,10 @@ the two digit hex code. For example: "<tt>!"test\00"</tt>".
exclamation point). For example: "<tt>!{ { } !"test\00", i32 10}</tt>".
</p>
<p>A metadata node will attempt to track changes to the values it holds. In
the event that a value is deleted, it will be replaced with a typeless
"<tt>null</tt>", such as "<tt>{ } !{null, i32 0}</tt>".</p>
<p>Optimizations may rely on metadata to provide additional information about
the program that isn't available in the instructions, or that isn't easily
computable. Similarly, the code generator may expect a certain metadata format