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a98d7fa6b0
GNU ld>=2.36 supports mixed SHF_LINK_ORDER and non-SHF_LINK_ORDER sections in an output section, so we can set SHF_LINK_ORDER if -fbinutils-version=2.36 or above. If -fno-function-sections or older binutils, drop unique ID for -fno-unique-section-names. The users can just specify -fbinutils-version=2.36 or above to allow GC with both GNU ld and LLD. (LLD does not support garbage collection of non-group non-SHF_LINK_ORDER .gcc_except_table sections.)
59 lines
3.0 KiB
LLVM
59 lines
3.0 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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declare void @ext()
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declare i32 @__gxx_personality_v0(...)
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