[PATCH] Implement Control Flow Integrity for virtual calls.

[Peter Collingbourne]

In my opinion, adding checks in LLVM would add significant complexity and/or require changing axioms relating to how IR is transformed. The transform to move the check after devirtualization would be relatively simple.

> Also: if we want to do CFI for non-virtual indirect calls, will we be adding it in clang or in llvm?


We would presumably be emitting the checks in clang.


http://reviews.llvm.org/D7424

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