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

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[Sema] Mark array element destructors referenced during initialization This fixes a crash where we would neglect to mark a destructor referenced for an __attribute__((no_destory)) array. The destructor is needed though, since if an exception is thrown we need to cleanup the elements. rdar://48462498 Differential revision: https://reviews.llvm.org/D61165 llvm-svn: 360446
2019-05-11 01:52:26 +08:00
// RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-macosx10.13.0 -o - | FileCheck %s --check-prefixes=CHECK,NO_EXCEPTIONS
// RUN: %clang_cc1 -fexceptions %s -emit-llvm -triple x86_64-apple-macosx10.13.0 -o - | FileCheck %s --check-prefixes=CHECK,EXCEPTIONS
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
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();
};
For P0784R7: compute whether a variable has constant destruction if it has a constexpr destructor. For constexpr variables, reject if the variable does not have constant destruction. In all cases, do not emit runtime calls to the destructor for variables with constant destruction. llvm-svn: 373159
2019-09-29 13:08:46 +08:00
// CHECK: __cxa_atexit{{.*}}_ZN11NonTrivial2D1Ev{{.*}}nt21
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
NonTrivial2 nt21;
For P0784R7: compute whether a variable has constant destruction if it has a constexpr destructor. For constexpr variables, reject if the variable does not have constant destruction. In all cases, do not emit runtime calls to the destructor for variables with constant destruction. llvm-svn: 373159
2019-09-29 13:08:46 +08:00
// CHECK: _tlv_atexit{{.*}}_ZN11NonTrivial2D1Ev{{.*}}nt22
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
thread_local NonTrivial2 nt22;
[Sema] Mark array element destructors referenced during initialization This fixes a crash where we would neglect to mark a destructor referenced for an __attribute__((no_destory)) array. The destructor is needed though, since if an exception is thrown we need to cleanup the elements. rdar://48462498 Differential revision: https://reviews.llvm.org/D61165 llvm-svn: 360446
2019-05-11 01:52:26 +08:00
// CHECK-LABEL: define void @_Z1fv
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
void f() {
// CHECK: __cxa_atexit{{.*}}_ZN11NonTrivial2D1Ev
static NonTrivial2 nt21;
// CHECK: _tlv_atexit{{.*}}_ZN11NonTrivial2D1Ev
thread_local NonTrivial2 nt22;
}
[Sema] Mark array element destructors referenced during initialization This fixes a crash where we would neglect to mark a destructor referenced for an __attribute__((no_destory)) array. The destructor is needed though, since if an exception is thrown we need to cleanup the elements. rdar://48462498 Differential revision: https://reviews.llvm.org/D61165 llvm-svn: 360446
2019-05-11 01:52:26 +08:00
// CHECK-LABEL: define void @_Z1gv
void g() {
// CHECK-NOT: __cxa_atexit
[[clang::no_destroy]] static NonTrivial2 nt21;
// CHECK-NOT: _tlv_atexit
[[clang::no_destroy]] thread_local NonTrivial2 nt22;
}
// CHECK-LABEL: define internal void @__cxx_global_var_init
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
// CHECK: __cxa_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::always_destroy]] NonTrivial nt3;
[Sema] Mark array element destructors referenced during initialization This fixes a crash where we would neglect to mark a destructor referenced for an __attribute__((no_destory)) array. The destructor is needed though, since if an exception is thrown we need to cleanup the elements. rdar://48462498 Differential revision: https://reviews.llvm.org/D61165 llvm-svn: 360446
2019-05-11 01:52:26 +08:00
// CHECK-LABEL: define internal void @__cxx_global_var_init
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
// CHECK: _tlv_atexit{{.*}}_ZN10NonTrivialD1Ev
[[clang::always_destroy]] thread_local NonTrivial nt4;
[Sema] Mark array element destructors referenced during initialization This fixes a crash where we would neglect to mark a destructor referenced for an __attribute__((no_destory)) array. The destructor is needed though, since if an exception is thrown we need to cleanup the elements. rdar://48462498 Differential revision: https://reviews.llvm.org/D61165 llvm-svn: 360446
2019-05-11 01:52:26 +08:00
struct NonTrivial3 {
NonTrivial3();
~NonTrivial3();
};
[[clang::no_destroy]] NonTrivial3 arr[10];
// CHECK-LABEL: define internal void @__cxx_global_var_init
// CHECK: {{invoke|call}} void @_ZN11NonTrivial3C1Ev
// EXCEPTIONS: call void @_ZN11NonTrivial3D1Ev
// NO_EXCEPTIONS-NOT: call void @_ZN11NonTrivial3D1Ev
// CHECK-NOT: call i32 @__cxa_atexit
void h() {
[[clang::no_destroy]] static NonTrivial3 slarr[10];
}
// CHECK-LABEL: define void @_Z1hv
// CHECK: {{invoke|call}} void @_ZN11NonTrivial3C1Ev
// EXCEPTIONS: call void @_ZN11NonTrivial3D1Ev
// NO_EXCEPTIONS-NOT: call void @_ZN11NonTrivial3D1Ev
// CHECK-NOT: call i32 @__cxa_atexit
void i() {
[[clang::no_destroy]] thread_local NonTrivial3 tlarr[10];
}
// CHECK-LABEL: define void @_Z1iv
// CHECK: {{invoke|call}} void @_ZN11NonTrivial3C1Ev
// EXCEPTIONS: call void @_ZN11NonTrivial3D1Ev
// NO_EXCEPTIONS-NOT: call void @_ZN11NonTrivial3D1Ev
// CHECK-NOT: _tlv_atexit