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3 Commits

Author SHA1 Message Date
Dan Gohman
f98e4f70d1 [WebAssembly] Don't abort on code with UB. 
Gracefully leave code that performs function-pointer bitcasts implying
non-trivial pointer conversions alone, rather than aborting, since it's
just undefined behavior.

llvm-svn: 291326
 2017-01-07 01:50:01 +00:00
Dan Gohman
278666eda3 [WebAssembly] Move a SmallVector to a more specific scope. NFC. 
llvm-svn: 291324
 2017-01-07 01:31:18 +00:00
Dan Gohman
8d46f8cefc [WebAssembly] Add a pass to create wrappers for function bitcasts. 
WebAssembly requires caller and callee signatures to match exactly. In LLVM,
there are a variety of circumstances where signatures may be mismatched in
practice, and one can bitcast a function address to another type to call it
as that type. This patch adds a pass which replaces bitcasted function
addresses with wrappers to replace the bitcasts.

This doesn't catch everything, but it does match many common cases.

llvm-svn: 291315
 2017-01-07 00:34:54 +00:00