[PATCH] tsan: support C++ exceptions

[Reid Kleckner]

I think the GC lowering code does a similar cleanup insertion, so you can
check that out. Here's a sketch of how to add a cleanup, though.

First, find all call insts that might throw. If there are any, create a new
landingpad for them.

For all landingpads, mark them as having cleanups.

Exit early if there were no calls or landingpads.

Create a new basic block with the cleanup code.

Replace all resume insts with a branch to the new block. If you created a
new lpad, have that branch here too.

Create a phi node in the new block to join together the resume values and
new landing pad value.

Terminate the new block with a resume that uses the phi.

There are some special cases where you can simplify the cfg, but that's the
general idea.

Sent from phone


http://reviews.llvm.org/D10740

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