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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
9 lines
398 B
C
9 lines
398 B
C
// REQUIRES: x86-registered-target
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// RUN: %clang_cc1 -S -triple x86_64 -fxray-instrument -fxray-instruction-threshold=1 %s -o - | FileCheck %s
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// RUN: %clang_cc1 -S -triple x86_64 -fxray-instrument -fxray-instruction-threshold=1 -fno-xray-function-index %s -o - | FileCheck %s --check-prefix=NO
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// CHECK: .section xray_fn_idx,"ao",@progbits,foo
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// NO-NOT: .section xray_fn_idx
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void foo(void) {}
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