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Author SHA1 Message Date
Dan Gohman 3a762bf9df [WebAssembly] Reapply r319186: "Support bitcasted function addresses with varargs." 
This puts the functionality under control of a command-line option which is
off by default to avoid breaking existing setups.

llvm-svn: 320197
 2017-12-08 21:27:00 +00:00
Dan Gohman 78c19d60a9 [WebAssembly] Revert r319186 "Support bitcasted function addresses with varargs." 
The patch broke Emscripten's EM_ASM macros, which utiltize unprototyped
functions.

See https://bugs.llvm.org/show_bug.cgi?id=35385 for details.

llvm-svn: 319452
 2017-11-30 18:16:49 +00:00
Dan Gohman 2803bfaf00 [WebAssembly] Support bitcasted function addresses with varargs. 
Generalize FixFunctionBitcasts to handle varargs functions. This in
particular fixes the case where clang bitcasts away a varargs when
calling a K&R-style function.

This avoids interacting with tricky ABI details because it operates
at the LLVM IR level before varargs ABI details are exposed.

This fixes PR35385.

llvm-svn: 319186
 2017-11-28 17:15:03 +00:00