[LLVMdev] Internalize pass

[Talin]

I'm playing around with different combinations of LTO passes, and I've run
into a strange problem:
I have a 'main' function that looks like this:

define i32
@"main(tart.core.Array[tart.core.String])->int"(%"tart.core.Array[tart.core.String]"*
%args) {
entry:
  call void @llvm.dbg.func.start(metadata !0)
  call void @llvm.dbg.stoppoint(i32 2, i32 19, metadata !1)
  %integerLimitsTest = call { } @integerLimitsTest() ; <{ }> [#uses=0]
  call void @llvm.dbg.stoppoint(i32 3, i32 21, metadata !1)
  %integerToStringTest = call { } @integerToStringTest() ; <{ }> [#uses=0]
  call void @llvm.dbg.stoppoint(i32 4, i32 9, metadata !1)
  call void @llvm.dbg.region.end(metadata !0)
  ret i32 0
}


However, when I add an internalize pass before the other LTO passes, the
'main' function turns into this:

define i32 @main(i32, i8** nocapture) nounwind readnone {
entry:
  tail call void @llvm.dbg.func.start(metadata !0)
  tail call void @llvm.dbg.stoppoint(i32 3, i32 21, metadata !1)
  unreachable
}


The thing is, there's nothing particularly special or interesting about the
functions being called from main().

Any clues?

-- 
-- Talin
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