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Stub out a new updating interface to AliasAnalysis, allowing stateful analyses to be informed when

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a pointer value has potentially become escaping.  Implementations can choose to either fall back to
conservative responses for that value, or may recompute their analysis to accomodate the change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122777 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2011-01-03 21:38:41 +00:00
parent 375e5a380c
commit ab6acc6ecd
3 changed files with 40 additions and 1 deletions
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11
include/llvm/Analysis/AliasAnalysis.h
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@@ -469,6 +469,17 @@ public:
///
virtual void copyValue(Value *From, Value *To);
/// addEscapingUse - This method should be used whenever an escaping use is
/// added to a pointer value. Analysis implementations may either return
/// conservative responses for that value in the future, or may recompute
/// some or all internal state to continue providing precise responses.
///
/// Escaping uses are considered by anything _except_ the following:
/// - GEPs or bitcasts of the pointer
/// - Loads through the pointer
/// - Stores through (but not of) the pointer
virtual void addEscapingUse(Use &U);
/// replaceWithNewValue - This method is the obvious combination of the two
/// above, and it provided as a helper to simplify client code.
///