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Part of https://bugs.llvm.org/show_bug.cgi?id=41734 LTO can drop externally available definitions. Such AssociatedSymbol is not associated with a symbol. ELFWriter::writeSection() will assert. Allow a SHF_LINK_ORDER section to have sh_link=0. We need to give sh_link a syntax, a literal zero in the linked-to symbol position, e.g. `.section name,"ao",@progbits,0` Reviewed By: pcc Differential Revision: https://reviews.llvm.org/D72899
24 lines
848 B
LLVM
24 lines
848 B
LLVM
;; Test that we keep SHF_LINK_ORDER but reset sh_link to 0 if the associated
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;; symbol is not defined.
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; RUN: llc -mtriple=x86_64 -data-sections=1 < %s | FileCheck %s
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; RUN: llc -filetype=obj -mtriple=x86_64 -data-sections=1 < %s | llvm-readelf -S - | FileCheck --check-prefix=SEC %s
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;; FIXME The assembly output cannot be assembled because foo is not defined.
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;; This is difficult to fix because we allow loops (see elf-associated.ll
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;; .data.c and .data.d).
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; CHECK: .section .data.a,"awo",@progbits,foo
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; CHECK: .section .data.b,"awo",@progbits,foo
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;; No 'L' (SHF_LINK_ORDER). sh_link=0.
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; SEC; Name {{.*}} Flg Lk Inf
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; SEC: .data.a {{.*}} WAL 0 0
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; SEC: .data.b {{.*}} WAL 0 0
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;; The definition may be discarded by LTO.
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declare void @foo()
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@a = global i32 1, !associated !0
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@b = global i32 1, !associated !0
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!0 = !{void ()* @foo}
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