3924877932
In the textual format, `noduplicates` means no COMDAT/section group deduplication is performed. Therefore, if both sets of sections are retained, and they happen to define strong external symbols with the same names, there will be a duplicate definition linker error. In PE/COFF, the selection kind lowers to `IMAGE_COMDAT_SELECT_NODUPLICATES`. The name describes the corollary instead of the immediate semantics. The name can cause confusion to other binary formats (ELF, wasm) which have implemented/ want to implement the "no deduplication" selection kind. Rename it to be clearer. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D106319
81 lines
3.9 KiB
LLVM
81 lines
3.9 KiB
LLVM
; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -binutils-version=2.35 | FileCheck %s --check-prefixes=CHECK,NORMAL
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; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -binutils-version=2.36 | FileCheck %s --check-prefixes=CHECK,NORMAL
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; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -function-sections -binutils-version=2.35 | FileCheck %s --check-prefixes=CHECK,SEP_BFD
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; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -function-sections -binutils-version=2.36 | FileCheck %s --check-prefixes=CHECK,SEP
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; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -function-sections -unique-section-names=false | FileCheck %s --check-prefixes=CHECK,SEP_NOUNIQUE
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; RUN: llc -simplifycfg-require-and-preserve-domtree=1 < %s -mtriple=x86_64 -unique-section-names=false | FileCheck %s --check-prefixes=CHECK,NOUNIQUE
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@_ZTIi = external constant i8*
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;; If the function is in a comdat group, the generated .gcc_except_table should
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;; be placed in the same group, so that .gcc_except_table can be discarded if
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;; the comdat is not prevailing. If -funique-section-names, append the function name.
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$group = comdat any
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define i32 @group() uwtable comdat personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: group:
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; CHECK: .cfi_endproc
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; NORMAL-NEXT: .section .gcc_except_table.group,"aG",@progbits,group,comdat{{$}}
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; SEP_BFD-NEXT: .section .gcc_except_table.group,"aG",@progbits,group,comdat{{$}}
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; SEP-NEXT: .section .gcc_except_table.group,"aGo",@progbits,group,comdat,group{{$}}
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; SEP_NOUNIQUE-NEXT: .section .gcc_except_table,"aG",@progbits,group,comdat{{$}}
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; NOUNIQUE-NEXT: .section .gcc_except_table,"aG",@progbits,group,comdat{{$}}
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entry:
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invoke void @ext() to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 } catch i8* bitcast (i8** @_ZTIi to i8*)
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br label %eh.resume
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try.cont:
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ret i32 0
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eh.resume:
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resume { i8*, i32 } %0
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}
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;; If the function is not in a comdat group, but function sections is enabled,
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;; use a separate section by either using a unique ID (integrated assembler) or
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;; a suffix (GNU as<2.35).
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define i32 @foo() uwtable personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: foo:
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; CHECK: .cfi_endproc
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; NORMAL-NEXT: .section .gcc_except_table,"a",@progbits{{$}}
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; SEP_BFD-NEXT: .section .gcc_except_table.foo,"a",@progbits{{$}}
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; SEP-NEXT: .section .gcc_except_table.foo,"ao",@progbits,foo{{$}}
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; SEP_NOUNIQUE-NEXT: .section .gcc_except_table,"a",@progbits{{$}}
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; NOUNIQUE-NEXT: .section .gcc_except_table,"a",@progbits{{$}}
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entry:
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invoke void @ext() to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 } catch i8* bitcast (i8** @_ZTIi to i8*)
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br label %eh.resume
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try.cont:
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ret i32 0
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eh.resume:
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resume { i8*, i32 } %0
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}
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;; If the function is in a comdat group with nodeduplicate kind, the generated
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;; .gcc_except_table should is lowered to a zero-flag ELF section group.
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$zero = comdat nodeduplicate
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define i32 @zero() uwtable comdat personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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; CHECK-LABEL: zero:
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; CHECK: .cfi_endproc
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; NORMAL-NEXT: .section .gcc_except_table.zero,"aG",@progbits,zero{{$}}
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; SEP_BFD-NEXT: .section .gcc_except_table.zero,"aG",@progbits,zero{{$}}
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; SEP-NEXT: .section .gcc_except_table.zero,"aGo",@progbits,zero,zero{{$}}
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; SEP_NOUNIQUE-NEXT: .section .gcc_except_table,"aG",@progbits,zero{{$}}
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; NOUNIQUE-NEXT: .section .gcc_except_table,"aG",@progbits,zero{{$}}
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entry:
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invoke void @ext() to label %try.cont unwind label %lpad
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lpad:
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%0 = landingpad { i8*, i32 } catch i8* bitcast (i8** @_ZTIi to i8*)
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br label %eh.resume
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try.cont:
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ret i32 0
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eh.resume:
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resume { i8*, i32 } %0
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}
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declare void @ext()
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declare i32 @__gxx_personality_v0(...)
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