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llvm-project/llvm/test/Linker/comdat13.ll

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Bring r254336 back: The difference is that now we don't error on out-of-comdat access to internal global values. We copy them instead. This seems to match the expectation of COFF linkers (see pr25686). Original message: Start deciding earlier what to link. A traditional linker is roughly split in symbol resolution and "copying stuff". The two tasks are badly mixed in lib/Linker. This starts splitting them apart. With this patch there are no direct call to linkGlobalValueBody or linkGlobalValueProto. Everything is linked via WapValue. This also includes a few fixes: * A GV goes undefined if the comdat is dropped (comdat11.ll). * We error if an internal GV goes undefined (comdat13.ll). * We don't link an unused comdat. The first two match the behavior of an ELF linker. The second one is equivalent to running globaldce on the input. llvm-svn: 254418
2015-12-01 23:19:48 +08:00
; RUN: llvm-link -S %s %p/Inputs/comdat13.ll -o - | FileCheck %s
; In Inputs/comdat13.ll a function not in the $foo comdat (zed) references an
; internal function in the comdat $foo.
; The IR would be ilegal on ELF ("relocation refers to discarded section"),
; but COFF linkers seem to just duplicate the comdat.
$foo = comdat any
@foo = internal global i8 0, comdat
define i8* @bar() {
ret i8* @foo
}
; CHECK: $foo = comdat any
; CHECK: @foo = internal global i8 0, comdat
; CHECK: @foo.1 = internal global i8 1, comdat($foo)
; CHECK: define i8* @bar() {
; CHECK-NEXT: ret i8* @foo
; CHECK-NEXT: }
; CHECK: define i8* @zed() {
; CHECK-NEXT: call void @bax()
; CHECK-NEXT: ret i8* @foo.1
; CHECK-NEXT: }
; CHECK: define internal void @bax() comdat($foo) {
; CHECK-NEXT: ret void
; CHECK-NEXT: }