llvm-mirror/test/Linker/comdat13.ll
Rafael Espindola e91510452a 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 15:19:48 +00:00

31 lines
832 B
LLVM

; 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: }