0ff0892470
- Fixes https://github.com/llvm/llvm-project/issues/163369 - Segmentation fault occurred because resolver was calling TSan instrumentation functions (__tsan_func_entry, __tsan_func_exit) but as the resolver is run by the dynamic linker at load time, TSan is not initialized yet so the current thread pointer is null. - This PR adds the DisableSanitizerInstrumentation attribute to the multiversion function resolvers to avoid issues like this. - Added regression test for TSan segfault.
32 lines
1.3 KiB
C++
32 lines
1.3 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,LINUX
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// RUN: %clang_cc1 -triple x86_64-apple-macos -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,LINUX
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// RUN: %clang_cc1 -triple x86_64-windows-pc -fms-compatibility -emit-llvm -o - %s | FileCheck %s --check-prefixes=CHECK,WINDOWS
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struct S {
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__attribute__((cpu_specific(atom)))
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void Func(){}
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__attribute__((cpu_dispatch(ivybridge,atom)))
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void Func(){}
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};
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void foo() {
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S s;
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s.Func();
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}
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// LINUX: @_ZN1S4FuncEv = weak_odr alias void (ptr), ptr @_ZN1S4FuncEv.ifunc
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// LINUX: @_ZN1S4FuncEv.ifunc = weak_odr ifunc void (ptr), ptr @_ZN1S4FuncEv.resolver
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// LINUX: define weak_odr ptr @_ZN1S4FuncEv.resolver() #[[ATTR_RESOLVER:[0-9]+]]
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// LINUX: ret ptr @_ZN1S4FuncEv.S
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// LINUX: ret ptr @_ZN1S4FuncEv.O
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// LINUX: declare void @_ZN1S4FuncEv.S
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// LINUX: define linkonce_odr void @_ZN1S4FuncEv.O
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// WINDOWS: define weak_odr dso_local void @"?Func@S@@QEAAXXZ"(ptr %0) #[[ATTR_RESOLVER:[0-9]+]] comdat
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// WINDOWS: musttail call void @"?Func@S@@QEAAXXZ.S"(ptr %0)
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// WINDOWS: musttail call void @"?Func@S@@QEAAXXZ.O"(ptr %0)
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// WINDOWS: declare dso_local void @"?Func@S@@QEAAXXZ.S"
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// WINDOWS: define linkonce_odr dso_local void @"?Func@S@@QEAAXXZ.O"
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// CHECK: attributes #[[ATTR_RESOLVER]] = { disable_sanitizer_instrumentation }
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