7620f03ef7
When both SHF_LINK_ORDER | SHF_GROUP flags are set, GNU assembler from 2.35 onwards (https://sourceware.org/PR25381 https://sourceware.org/binutils/docs/as/Section.html) parses the SHF_LINK_ORDER argument before section group name, different from us. This is unfortunate, but does not matter because the `.section` flag `o` is a niche feature only used by compiler instrumentations, not adopted by hand-written assembly, and using both flags is extremely rare. Let's just match GNU assembler. There is another benefit: we now support zero-flag section group with the SHF_LINK_ORDER flag, while previously there isn't a syntax. While here, print 'G' after 'o' to be clear that the 'G' argument is parsed after the 'o' argument. To make the diff smaller, we don't print 'G' after 'w' in the absence of 'o' for now.
103 lines
3.3 KiB
LLVM
103 lines
3.3 KiB
LLVM
; RUN: llc -mtriple=aarch64 %s -o - | FileCheck %s
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; RUN: llc -mtriple=aarch64 -function-sections %s -o - | FileCheck %s
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; RUN: llc -mtriple=aarch64 -function-sections %s -o - | FileCheck %s
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; RUN: llc -mtriple=aarch64 -no-integrated-as -binutils-version=2.35 %s -o - | FileCheck --check-prefix=NOLINK %s
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; RUN: llc -mtriple=aarch64 -no-integrated-as -binutils-version=2.36 %s -o - | FileCheck %s
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;; GNU ld < 2.36 did not support mixed SHF_LINK_ORDER and non-SHF_LINK_ORDER sections.
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; NOLINK-NOT: "awo"
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define i32 @f0() "patchable-function-entry"="0" {
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; CHECK-LABEL: f0:
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; CHECK-NEXT: .Lfunc_begin0:
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; CHECK-NOT: nop
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; CHECK: mov w0, wzr
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; CHECK-NOT: .section __patchable_function_entries
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ret i32 0
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}
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define i32 @f1() "patchable-function-entry"="1" {
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; CHECK-LABEL: f1:
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; CHECK-NEXT: .Lfunc_begin1:
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; CHECK: nop
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; CHECK-NEXT: mov w0, wzr
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f1{{$}}
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; CHECK-NEXT: .p2align 3
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; CHECK-NEXT: .xword .Lfunc_begin1
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ret i32 0
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}
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;; Without -function-sections, f2 is in the same text section as f1.
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;; They share the __patchable_function_entries section.
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;; With -function-sections, f1 and f2 are in different text sections.
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;; Use separate __patchable_function_entries.
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define void @f2() "patchable-function-entry"="2" {
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; CHECK-LABEL: f2:
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; CHECK-NEXT: .Lfunc_begin2:
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; CHECK-COUNT-2: nop
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; CHECK-NEXT: ret
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f2{{$}}
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; CHECK-NEXT: .p2align 3
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; CHECK-NEXT: .xword .Lfunc_begin2
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ret void
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}
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$f3 = comdat any
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define void @f3() "patchable-function-entry"="3" comdat {
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; CHECK-LABEL: f3:
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; CHECK-NEXT: .Lfunc_begin3:
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; CHECK-COUNT-3: nop
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; CHECK-NEXT: ret
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; CHECK: .section __patchable_function_entries,"awoG",@progbits,f3,f3,comdat{{$}}
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; CHECK-NEXT: .p2align 3
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; CHECK-NEXT: .xword .Lfunc_begin3
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ret void
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}
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$f5 = comdat any
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define void @f5() "patchable-function-entry"="5" comdat {
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; CHECK-LABEL: f5:
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; CHECK-NEXT: .Lfunc_begin4:
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; CHECK-COUNT-5: nop
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; CHECK-NEXT: sub sp, sp, #16
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; CHECK: .section __patchable_function_entries,"awoG",@progbits,f5,f5,comdat{{$}}
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; CHECK: .p2align 3
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; CHECK-NEXT: .xword .Lfunc_begin4
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%frame = alloca i8, i32 16
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ret void
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}
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;; -fpatchable-function-entry=3,2
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;; "patchable-function-prefix" emits data before the function entry label.
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define void @f3_2() "patchable-function-entry"="1" "patchable-function-prefix"="2" {
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; CHECK-LABEL: .type f3_2,@function
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; CHECK-NEXT: .Ltmp1:
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: f3_2: // @f3_2
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; CHECK: // %bb.0:
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; CHECK-NEXT: nop
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; CHECK-NEXT: ret
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;; .size does not include the prefix.
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; CHECK: .Lfunc_end5:
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; CHECK-NEXT: .size f3_2, .Lfunc_end5-f3_2
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f3_2{{$}}
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; CHECK: .p2align 3
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; CHECK-NEXT: .xword .Ltmp1
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ret void
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}
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;; When prefix data is used, arbitrarily place NOPs after prefix data.
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define void @prefix() "patchable-function-entry"="0" "patchable-function-prefix"="1" prefix i32 1 {
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; CHECK-LABEL: .type prefix,@function
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; CHECK-NEXT: .word 1 // 0x1
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; CHECK: .Ltmp2:
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; CHECK: nop
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; CHECK-NEXT: prefix: // @prefix
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;; Emit a __patchable_function_entries entry even if "patchable-function-entry" is 0.
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; CHECK: .section __patchable_function_entries,"awo",@progbits,prefix{{$}}
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; CHECK: .p2align 3
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; CHECK-NEXT: .xword .Ltmp2
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ret void
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}
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