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llvm-project/clang/test/CodeGenCXX/cxx2a-destroying-delete.cpp
Aiden Grossman 4ec1fea922 Reapply "[Clang] Mark this pointer in destructors dead_on_return (#166276)" 
This reverts commit 047db150c66e245e9df7db178b893ce6b29820f5.

The original version of the commit caused assertion failures in DSE.
Those were fixed in ec059d81aafedb253a02d6f490ad9b9747611038, so trying
to reland this again.
2026-02-08 05:00:29 +00:00

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// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm %s -triple x86_64-linux-gnu -o - | FileCheck %s --check-prefixes=CHECK,CHECK-ITANIUM,CHECK-64BIT
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm %s -triple x86_64-windows -o - | FileCheck %s --check-prefixes=CHECK,CHECK-MSABI,CHECK-MSABI64,CHECK-64BIT,CLANG22-MSABI,CLANG22-MSABI64
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm %s -triple i386-windows -o - | FileCheck %s --check-prefixes=CHECK,CHECK-MSABI,CHECK-MSABI32,CHECK-32BIT,CLANG22-MSABI,CLANG22-MSABI32
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm %s -triple i386-windows -fclang-abi-compat=20 -o - | FileCheck %s --check-prefixes=CHECK,CHECK-MSABI,CHECK-32BIT,CHECK-MSABI32,CLANG21-MSABI,CLANG21-MSABI32
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm %s -triple x86_64-windows -fclang-abi-compat=20 -o - | FileCheck %s --check-prefixes=CHECK,CHECK-MSABI,CHECK-MSABI64,CHECK-64BIT,CLANG21-MSABI,CLANG21-MSABI64
// PR46908: ensure the IR passes the verifier with optimizations enabled.
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm-only %s -triple x86_64-linux-gnu -O2
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm-only %s -triple x86_64-windows -O2
// RUN: %clang_cc1 -std=c++2a -fexceptions -emit-llvm-only %s -triple i386-windows -O2
namespace std {
using size_t = decltype(sizeof(0));
enum class align_val_t : size_t;
struct destroying_delete_t {};
}
struct A {
void *data;
~A();
void operator delete(A*, std::destroying_delete_t);
};
void delete_A(A *a) { delete a; }
// CHECK-LABEL: define {{.*}}delete_A
// CHECK: %[[a:.*]] = load
// CHECK: icmp eq ptr %[[a]], null
// CHECK: br i1
//
// Ensure that we call the destroying delete and not the destructor.
// CHECK-NOT: call
// CHECK-ITANIUM: call void @_ZN1AdlEPS_St19destroying_delete_t(ptr noundef %[[a]])
// CHECK-MSABI64: call void @"??3A@@SAXPEAU0@Udestroying_delete_t@std@@@Z"(ptr noundef %[[a]], i8
// CHECK-MSABI32: call void @"??3A@@SAXPAU0@Udestroying_delete_t@std@@@Z"(ptr noundef %[[a]], ptr noundef byval(%{{.*}}) align 4 %{{.*}})
// CHECK-NOT: call
// CHECK: }
void glob_delete_A(A *a) { ::delete a; }
// CHECK-LABEL: define {{.*}}glob_delete_A
// CHECK: %[[a:.*]] = load
// CHECK: icmp eq ptr %[[a]], null
// CHECK: br i1
// CHECK-ITANIUM: call void @_ZN1AD1Ev(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %[[a]])
// CHECK-ITANIUM-NEXT: call void @_ZdlPvm(ptr noundef %[[a]], i64 noundef 8)
// CHECK-MSABI64: call void @"??1A@@QEAA@XZ"(ptr noundef nonnull align 8 dead_on_return(8) dereferenceable(8) %[[a]])
// CHECK-MSABI64-NEXT: call void @"??3@YAXPEAX_K@Z"(ptr noundef %[[a]], i64 noundef 8)
// CHECK-MSABI32: call x86_thiscallcc void @"??1A@@QAE@XZ"(ptr noundef nonnull align 4 dead_on_return(4) dereferenceable(4) %[[a]])
// CHECK-MSABI32-NEXT: call void @"??3@YAXPAXI@Z"(ptr noundef %[[a]], i32 noundef 4)
struct B {
virtual ~B();
void operator delete(B*, std::destroying_delete_t);
};
void delete_B(B *b) { delete b; }
// CHECK-LABEL: define {{.*}}delete_B
// CHECK: %[[b:.*]] = load
// CHECK: icmp eq ptr %[[b]], null
// CHECK: br i1
//
// Ensure that we call the virtual destructor and not the operator delete.
// CHECK-NOT: call
// CHECK: %[[VTABLE:.*]] = load
// CHECK: %[[DTOR:.*]] = load
// CHECK: call {{void|noundef ptr|x86_thiscallcc noundef ptr}} %[[DTOR]](ptr {{[^,]*}} %[[b]]
// CHECK-MSABI-SAME: , i32 noundef 1)
// CHECK-NOT: call
// CHECK: }
void glob_delete_B(B *b) { ::delete b; }
// CHECK-LABEL: define {{.*}}glob_delete_B
// CHECK: %[[b:.*]] = load
// CHECK: icmp eq ptr %[[b]], null
// CHECK: br i1
// CHECK-NOT: call
// CHECK-MSABI: %[[VTABLE:.*]] = load
// CHECK-MSABI: %[[DTOR:.*]] = load
// CHECK-ITANIUM: %[[VTABLE:.*]] = load ptr, ptr %[[b]], align 8
// CHECK-ITANIUM: %[[COMPLETEOFFSETPTR:.*]] = getelementptr inbounds i64, ptr %[[VTABLE]], i64 -2
// CHECK-ITANIUM: %[[OFFSET:.*]] = load i64, ptr %[[COMPLETEOFFSETPTR]], align 8
// CHECK-ITANIUM: %[[ALLOCATED:.*]] = getelementptr inbounds i8, ptr %[[b]], i64 %[[OFFSET]]
// CHECK-ITANIUM: %[[VTABLE1:.*]] = load ptr, ptr %[[b]], align 8
// CHECK-ITANIUM: %[[DTOR_ADDR:.*]] = getelementptr inbounds ptr, ptr %[[VTABLE1]], i64 0
// CHECK-ITANIUM: %[[DTOR:.*]] = load ptr, ptr %[[DTOR_ADDR]], align 8
// CHECK: call {{void|noundef ptr|x86_thiscallcc noundef ptr}} %[[DTOR]](ptr {{[^,]*}} %[[b]]
// CLANG22-MSABI-SAME: , i32 noundef 5)
// CLANG21-MSABI-SAME: , i32 noundef 0)
// CLANG22-MSABI-NOT: call
// CLANG21-MSABI64: call void @"??3@YAXPEAX_K@Z"({{.*}})
// CLANG21-MSABI32: call void @"??3@YAXPAXI@Z"({{.*}})
// CHECK-ITANIUM: call void @_ZdlPvm({{.*}})
// CHECK: }
struct Padding {
virtual void f();
};
struct C : Padding, A {};
void delete_C(C *c) { delete c; }
// Check that we perform a derived-to-base conversion on the parameter to 'operator delete'.
// CHECK-LABEL: define {{.*}}delete_C
// CHECK: %[[c:.*]] = load
// CHECK: icmp eq ptr %[[c]], null
// CHECK: br i1
//
// CHECK-64BIT: %[[base:.*]] = getelementptr {{.*}}, i64 8
// CHECK-32BIT: %[[base:.*]] = getelementptr {{.*}}, i32 4
//
// CHECK: %[[a:.*]] = phi {{.*}} %[[base]]
// CHECK: icmp eq ptr %[[a]], null
// CHECK: br i1
//
// CHECK-NOT: call
// CHECK-ITANIUM: call void @_ZN1AdlEPS_St19destroying_delete_t(ptr noundef %[[a]])
// CHECK-MSABI64: call void @"??3A@@SAXPEAU0@Udestroying_delete_t@std@@@Z"(ptr noundef %[[a]], i8
// CHECK-MSABI32: call void @"??3A@@SAXPAU0@Udestroying_delete_t@std@@@Z"(ptr noundef %[[a]], ptr noundef byval(%{{.*}}) align 4 %{{.*}})
// CHECK-NOT: call
// CHECK: }
struct VDel { virtual ~VDel(); };
struct D : Padding, VDel, B {};
void delete_D(D *d) { delete d; }
// CHECK-LABEL: define {{.*}}delete_D
// CHECK: %[[d:.*]] = load
// CHECK: icmp eq ptr %[[d]], null
// CHECK: br i1
//
// CHECK-NOT: call
// For MS, we don't add a new vtable slot to the primary vtable for the virtual
// destructor. Instead we cast to the VDel base class.
// CHECK-MSABI64: %[[d:.*]] = getelementptr {{.*}}, i64 8
// CHECK-MSABI32: %[[d:.*]] = getelementptr {{.*}}, i32 4
//
// CHECK: %[[VTABLE:.*]] = load
// CHECK: %[[DTOR:.*]] = load
//
// CHECK: call {{void|noundef ptr|x86_thiscallcc noundef ptr}} %[[DTOR]](ptr{{[^,]*}} %[[d]]
// CHECK-MSABI-SAME: , i32 noundef 1)
// CHECK-NOT: call
// CHECK: }
struct J {
J(); // might throw
void operator delete(J *, std::destroying_delete_t);
};
// CHECK-ITANIUM-LABEL: define {{.*}}@_Z1j
// CHECK-MSABI-LABEL: define {{.*}}@"?j@@
J *j() {
// CHECK-ITANIUM: invoke {{.*}}@_ZN1JC1Ev(
// CHECK-ITANIUM: call {{.*}}@_ZdlPvm(
// CHECK-NOT: }
// CHECK-MSABI: invoke {{.*}}@"??0J@@Q{{AE|EAA}}@XZ"(
// CHECK-MSABI: call {{.*}}@"??3@YAXP{{E?}}AX{{I|_K}}@Z"(
return new J;
// CHECK: }
}
struct K {
K(); // might throw
void operator delete(void *);
void operator delete(K *, std::destroying_delete_t);
};
// CHECK-ITANIUM-LABEL: define {{.*}}@_Z1k
// CHECK-MSABI-LABEL: define {{.*}}@"?k@@
K *k() {
// CHECK-ITANIUM: invoke {{.*}}@_ZN1KC1Ev(
// CHECK-ITANIUM: call {{.*}}@_ZN1KdlEPv(
// CHECK-NOT: }
// CHECK-MSABI: invoke {{.*}}@"??0K@@Q{{AE|EAA}}@XZ"(
// CHECK-MSABI: call {{.*}}@"??3K@@SAXP{{E?}}AX@Z"(
return new K;
// CHECK: }
}
struct E { void *data; };
struct F { void operator delete(F *, std::destroying_delete_t, std::size_t, std::align_val_t); void *data; };
struct alignas(16) G : E, F { void *data; };
void delete_G(G *g) { delete g; }
// CHECK-LABEL: define {{.*}}delete_G
// CHECK-NOT: call
// CHECK-ITANIUM: call void @_ZN1FdlEPS_St19destroying_delete_tmSt11align_val_t(ptr noundef %[[a]], i64 noundef 32, i64 noundef 16)
// CHECK-MSABI64: call void @"??3F@@SAXPEAU0@Udestroying_delete_t@std@@_KW4align_val_t@2@@Z"(ptr noundef %[[a]], i8 {{[^,]*}}, i64 noundef 32, i64 noundef 16)
// CHECK-MSABI32: call void @"??3F@@SAXPAU0@Udestroying_delete_t@std@@IW4align_val_t@2@@Z"(ptr noundef %[[a]], ptr noundef byval(%{{.*}}) align 4 %{{.*}}, i32 noundef 16, i32 noundef 16)
// CHECK-NOT: call
// CHECK: }
void call_in_dtor();
struct H : G { virtual ~H(); } h;
H::~H() { call_in_dtor(); }
// CHECK-ITANIUM-LABEL: define{{.*}} void @_ZN1HD0Ev(
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: getelementptr {{.*}}, i64 24
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: call void @_ZN1FdlEPS_St19destroying_delete_tmSt11align_val_t({{.*}}, i64 noundef 48, i64 noundef 16)
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: }
// CHECK-MSABI64-LABEL: define {{.*}} @"??_GH@@UEAAPEAXI@Z"({{.*}},
// CHECK-MSABI32-LABEL: define {{.*}} @"??_GH@@UAEPAXI@Z"(
// CHECK-MSABI-SAME: i32 noundef %[[IP:.*]])
// CHECK-MSABI-NOT: call{{ }}
// CHECK-MSABI: store i32 %[[IP]], ptr %[[IP_ALLOCA:.*]]
// CHECK-MSABI: %[[IMP_PARAM:.*]] = load i32, ptr %[[IP_ALLOCA]]
// CLANG22: %[[THIRDBIT:.*]] = and i32 %[[IMP_PARAM]], 4
// CLANG22-NEXT: %[[CHCK:.*]] = icmp eq i32 %[[THIRDBIT]], 0
// CLANG22-NEXT: br i1 %[[CHCK]], label %dtor.entry_cont, label %dtor.call_dtor
// CLANG21-MSABI: %[[FIRSTBIT:.*]] = and i32 %[[IMP_PARAM]], 1
// CLANG21-MSABI: %[[CHCK:.*]] = icmp eq i32 %[[FIRSTBIT]], 0
// CLANG21-MSABI: br i1 %[[CHCK]], label %dtor.continue, label %dtor.call_delete
//
// CLANG22-MSABI: dtor.call_dtor:
// CLANG22-MSABI64-NEXT: call void @"??1H@@UEAA@XZ"({{.*}})
// CLANG22-MSABI32-NEXT: call x86_thiscallcc void @"??1H@@UAE@XZ"({{.*}})
// CLANG22-MSABI-NEXT: br label %dtor.entry_cont
//
// CLANG22-MSABI-LABEL: dtor.entry_cont:
// CLANG22-MSABI-NEXT: %[[FIRSTBIT:.*]] = and i32 %[[IMP_PARAM]], 1
// CLANG22-MSABI-NEXT: %[[CHCK1:.*]] = icmp eq i32 %[[FIRSTBIT]], 0
// CLANG22-MSABI-NEXT: br i1 %[[CHCK1]], label %dtor.continue, label %dtor.call_delete
//
// CLANG22-MSABI-LABEL: dtor.call_delete:
// CLANG22-MSABI: %[[THIRDBIT1:.*]] = and i32 %[[IMP_PARAM]], 4
// CLANG22-MSABI-NEXT: %[[CHCK2:.*]] = icmp eq i32 %[[THIRDBIT1]], 0
// CLANG22-MSABI-NEXT: br i1 %[[CHCK2]], label %dtor.call_class_delete, label %dtor.call_glob_delete
//
// CLANG22-MSABI-LABEL: dtor.call_glob_delete:
// CLANG22-MSABI64: call void @"??3@YAXPEAX_K@Z"(ptr noundef %{{.*}}, i64 noundef 48)
// CLANG22-MSABI32: call void @"??3@YAXPAXIW4align_val_t@std@@@Z"(ptr noundef %{{.*}}, i32 noundef 32, i32 noundef 16)
// CLANG22-MSABI-NEXT: br label %[[RETURN:.*]]
//
// CLANG21-MSABI: dtor.call_delete:
// CLANG22-MSABI: dtor.call_class_delete:
// CLANG22-MSABI-NOT: call{{ }}
// CLANG22-MSABI64: getelementptr {{.*}}, i64 24
// CLANG22-MSABI32: getelementptr {{.*}}, i32 20
// CLANG22-MSABI-NOT: call{{ }}
// CHECK-MSABI64: call void @"??3F@@SAXPEAU0@Udestroying_delete_t@std@@_KW4align_val_t@2@@Z"({{.*}}, i64 noundef 48, i64 noundef 16)
// CHECK-MSABI32: call void @"??3F@@SAXPAU0@Udestroying_delete_t@std@@IW4align_val_t@2@@Z"({{.*}}, i32 noundef 32, i32 noundef 16)
// CHECK-MSABI: br label %[[RETURN:]]
//
// CHECK-MSABI: dtor.continue:
// CHECK-MSABI64: call void @"??1H@@UEAA@XZ"(
// CHECK-MSABI32: call x86_thiscallcc void @"??1H@@UAE@XZ"(
// CHECK-MSABI: br label %[[RETURN]]
//
// CHECK-MSABI: }
struct I : H { virtual ~I(); alignas(32) char buffer[32]; } i;
I::~I() { call_in_dtor(); }
// CHECK-ITANIUM-LABEL: define{{.*}} void @_ZN1ID0Ev(
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: getelementptr {{.*}}, i64 24
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: call void @_ZN1FdlEPS_St19destroying_delete_tmSt11align_val_t({{.*}}, i64 noundef 96, i64 noundef 32)
// CHECK-ITANIUM-NOT: call
// CHECK-ITANIUM: }
// CHECK-MSABI64-LABEL: define {{.*}} @"??_GI@@UEAAPEAXI@Z"(
// CHECK-MSABI32-LABEL: define {{.*}} @"??_GI@@UAEPAXI@Z"(
// CHECK-MSABI-NOT: call{{ }}
// CHECK-MSABI: load i32
// CLANG22-MSABI-NEXT: and i32 %[[IMP_PARAM:.*]], 4
// CLANG22-MSABI-NEXT: icmp eq i32 {{.*}}, 0
// CLANG22-MSABI-NEXT: br i1 %{{.*}}, label %dtor.entry_cont, label %dtor.call_dtor
//
// CLANG22-MSABI: dtor.call_dtor:
// CLANG22-MSABI64-NEXT: call void @"??1I@@UEAA@XZ"({{.*}})
// CLANG22-MSABI32-NEXT: call x86_thiscallcc void @"??1I@@UAE@XZ"({{.*}})
// CLANG22-MSABI-NEXT: br label %dtor.entry_cont
//
// CLANG22-MSABI: dtor.entry_cont:
// CLANG22-MSABI-NEXT: and i32 %[[IMP_PARAM]], 1
// CLANG22-MSABI-NEXT: icmp eq i32 %{{.*}}, 0
// CLANG22-MSABI-NEXT: br i1 %{{.*}}, label %dtor.continue, label %dtor.call_delete
//
// CLANG22-MSABI: dtor.call_delete:
// CLANG22-MSABI-NEXT: %[[THIRDBIT1:.*]] = and i32 %[[IMP_PARAM]], 4
// CLANG22-MSABI-NEXT: %[[CHCK2:.*]] = icmp eq i32 %[[THIRDBIT1]], 0
// CLANG22-MSABI-NEXT: br i1 %[[CHCK2]], label %dtor.call_class_delete, label %dtor.call_glob_delete
//
// CLANG22-MSABI: dtor.call_glob_delete:
// CLANG22-MSABI64: call void @"??3@YAXPEAX_KW4align_val_t@std@@@Z"(ptr noundef %{{.*}}, i64 noundef 96, i64 noundef 32)
// CLANG22-MSABI32: call void @"??3@YAXPAXIW4align_val_t@std@@@Z"(ptr noundef %{{.*}}, i32 noundef 64, i32 noundef 32)
// CLANG22-MSABI-NEXT: br label %[[RETURN:.*]]
//
// CLANG21-MSABI: dtor.call_delete:
// CLANG22-MSABI: dtor.call_class_delete:
// CHECK-MSABI-NOT: call{{ }}
// CHECK-MSABI64: getelementptr {{.*}}, i64 24
// CHECK-MSABI32: getelementptr {{.*}}, i32 20
// CHECK-MSABI-NOT: call{{ }}
// CHECK-MSABI64: call void @"??3F@@SAXPEAU0@Udestroying_delete_t@std@@_KW4align_val_t@2@@Z"({{.*}}, i64 noundef 96, i64 noundef 32)
// CHECK-MSABI32: call void @"??3F@@SAXPAU0@Udestroying_delete_t@std@@IW4align_val_t@2@@Z"({{.*}}, i32 noundef 64, i32 noundef 32)
// CHECK-MSABI: br label %[[RETURN:.*]]
//
// CHECK-MSABI64: call void @"??1I@@UEAA@XZ"(
// CHECK-MSABI32: call x86_thiscallcc void @"??1I@@UAE@XZ"(
// CHECK-MSABI: br label %[[RETURN]]
//
// CHECK-MSABI: }
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