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e8dd5bcb82
xray_instr_map contains absolute addresses of sleds, which are relocated by `R_*_RELATIVE` when linked in -pie or -shared mode. By making these addresses relative to PC, we can avoid the dynamic relocations and remove the SHF_WRITE flag from xray_instr_map. We can thus save VM pages containg xray_instr_map (because they are not modified). This patch changes x86-64 and bumps the sled version to 2. Subsequent changes will change powerpc64le and AArch64. Reviewed By: dberris, ianlevesque Differential Revision: https://reviews.llvm.org/D78082
19 lines
843 B
LLVM
19 lines
843 B
LLVM
; RUN: llc -verify-machineinstrs -filetype=asm -o - -mtriple=x86_64-unknown-linux-gnu -function-sections < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -filetype=obj -o %t -mtriple=x86_64-unknown-linux-gnu -function-sections < %s
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; RUN: llvm-objdump --triple=x86_64-unknown-linux-gnu --disassemble-all %t | FileCheck %s --check-prefix=CHECK-OBJ
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define i32 @foo() nounwind noinline uwtable "function-instrument"="xray-always" {
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; CHECK: .section .text.foo,"ax",@progbits
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ret i32 0
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; CHECK: .section xray_instr_map,"ao",@progbits,foo{{$}}
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}
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$bar = comdat any
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define i32 @bar() nounwind noinline uwtable "function-instrument"="xray-always" comdat($bar) {
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; CHECK: .section .text.bar,"axG",@progbits,bar,comdat
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ret i32 1
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; CHECK: .section xray_instr_map,"aGo",@progbits,bar,comdat,bar{{$}}
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}
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; CHECK-OBJ: section xray_instr_map:
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