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Author SHA1 Message Date
Dan Gohman 6736f59078 [WebAssemby] Re-apply r320041: "Support main functions with alternate signatures." 
This includes a fix so that it doesn't transform declarations, and it
puts the functionality under control of a command-line option which is off
by default to avoid breaking existing setups.

llvm-svn: 320196
 2017-12-08 21:18:21 +00:00
Derek Schuff 9e1baeda74 Revert "[WebAssemby] Support main functions with alternate signatures." 
This reverts commit 959e37e669b0c3cfad4cb9f1f7c9261ce9f5e9ae.
That commit doesn't handle the case where main is declared rather than defined,
in particular the even-more special case where main is a prototypeless
declaration (which is of course the one actually used by musl currently).

llvm-svn: 320121
 2017-12-08 00:39:54 +00:00
Dan Gohman cdaa87dd2e [WebAssemby] Support main functions with alternate signatures. 
WebAssembly requires caller and callee signatures to match, so the usual
C runtime trick of calling main and having it just work regardless of
whether main is defined as '()' or '(int argc, char *argv[])' doesn't
work. Extend the FixFunctionBitcasts pass to rewrite main to use the
latter form.

llvm-svn: 320041
 2017-12-07 13:49:27 +00:00