e0a6561ec9
As mentioned by commit c5d38924dc6688c15b3fa133abeb3626e8f0767c (Apr 2020), PC-relative entries avoid dynamic relocations and can therefore make the section read-only. This is similar to D78082 and D78590. We cannot commit to support compiler/runtime built at different versions, so just don't play with versions. For Mach-O support (incomplete yet), we use non-temporary `lxray_fn_idx[0-9]+` symbols. Label differences are represented as a pair of UNSIGNED and SUBTRACTOR relocations. The SUBTRACTOR external relocation requires r_extern==1 (needs to reference a symbol table entry) which can be satisfied by `lxray_fn_idx[0-9]+`. A `lxray_fn_idx[0-9]+` symbol also serves as the atom for this dead-strippable section (follow-up to commit b9a134aa629de23a1dcf4be32e946e4e308fc64d). Differential Revision: https://reviews.llvm.org/D152661
49 lines
1.7 KiB
LLVM
49 lines
1.7 KiB
LLVM
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
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; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -relocation-model=pic < %s | FileCheck %s
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define i32 @foo() nounwind noinline uwtable "function-instrument"="xray-always" {
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; CHECK-LABEL: foo:
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; CHECK-NEXT: .Lfunc_begin0:
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; CHECK: .Ltmp[[#l:]]:
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; CHECK-NEXT: b .Ltmp[[#l+1]]
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; CHECK-NEXT: nop
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; CHECK-NEXT: std 0, -8(1)
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; CHECK-NEXT: mflr 0
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; CHECK-NEXT: bl __xray_FunctionEntry
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; CHECK-NEXT: nop
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; CHECK-NEXT: mtlr 0
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; CHECK-NEXT: .Ltmp[[#l+1]]:
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ret i32 0
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; CHECK: .Ltmp[[#l+2]]:
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; CHECK-NEXT: blr
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; CHECK-NEXT: nop
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; CHECK-NEXT: std 0, -8(1)
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; CHECK-NEXT: mflr 0
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; CHECK-NEXT: bl __xray_FunctionExit
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; CHECK-NEXT: nop
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; CHECK-NEXT: mtlr 0
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}
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; CHECK-LABEL: xray_instr_map,"ao",@progbits,foo{{$}}
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; CHECK: .Lxray_sleds_start0:
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; CHECK-NEXT: [[TMP:.Ltmp[0-9]+]]:
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; CHECK-NEXT: .quad .Ltmp[[#l]]-[[TMP]]
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; CHECK-NEXT: .quad .Lfunc_begin0-([[TMP]]+8)
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; CHECK-NEXT: .byte 0x00
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .space 13
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; CHECK-NEXT: [[TMP:.Ltmp[0-9]+]]:
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; CHECK-NEXT: .quad .Ltmp[[#l+2]]-[[TMP]]
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; CHECK-NEXT: .quad .Lfunc_begin0-([[TMP]]+8)
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x01
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; CHECK-NEXT: .byte 0x02
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; CHECK-NEXT: .space 13
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; CHECK-NEXT: .Lxray_sleds_end0:
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; CHECK-LABEL: xray_fn_idx,"ao",@progbits,foo{{$}}
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; CHECK: .p2align 4
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; CHECK-NEXT: [[IDX:.Lxray_fn_idx[0-9]+]]:
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; CHECK-NEXT: .quad .Lxray_sleds_start0-[[IDX]]
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; CHECK-NEXT: .quad 2
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; CHECK-NEXT: .text
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