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llvm-project/clang/test/CodeGenCXX/no_destroy.cpp

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Add a new flag and attributes to control static destructor registration This commit adds the flag -fno-c++-static-destructors and the attributes [[clang::no_destroy]] and [[clang::always_destroy]]. no_destroy specifies that a specific static or thread duration variable shouldn't have it's destructor registered, and is the default in -fno-c++-static-destructors mode. always_destroy is the opposite, and is the default in -fc++-static-destructors mode. A variable whose destructor is disabled (either because of -fno-c++-static-destructors or [[clang::no_destroy]]) doesn't count as a use of the destructor, so we don't do any access checking or mark it referenced. We also don't emit -Wexit-time-destructors for these variables. rdar://21734598 Differential revision: https://reviews.llvm.org/D50994 llvm-svn: 340306
2018-08-22 01:24:06 +08:00
// RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-macosx10.13.0 -o - | FileCheck %s
struct NonTrivial {
~NonTrivial();
};
// CHECK-NOT: __cxa_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::no_destroy]] NonTrivial nt1;
// CHECK-NOT: _tlv_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::no_destroy]] thread_local NonTrivial nt2;
struct NonTrivial2 {
~NonTrivial2();
};
// CHECK: __cxa_atexit{{.*}}_ZN11NonTrivial2D1Ev
NonTrivial2 nt21;
// CHECK: _tlv_atexit{{.*}}_ZN11NonTrivial2D1Ev
thread_local NonTrivial2 nt22;
void f() {
// CHECK: __cxa_atexit{{.*}}_ZN11NonTrivial2D1Ev
static NonTrivial2 nt21;
// CHECK: _tlv_atexit{{.*}}_ZN11NonTrivial2D1Ev
thread_local NonTrivial2 nt22;
}
// CHECK: __cxa_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::always_destroy]] NonTrivial nt3;
// CHECK: _tlv_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::always_destroy]] thread_local NonTrivial nt4;