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llvm-project/clang/test/CodeGenCXX/microsoft-abi-structors.cpp
Reid Kleckner 0c12b36ebb MS ABI: Remove nv adjustment from direct vdtor calls and prologues 
Summary:
Generally the vector deleting dtor, which we model as a vtable thunk,
takes care of non-virtual adjustment and delegates to the other
destructor variants.  The other non-complete destructor variants assume
that 'this' on entry points to the virtual base subobject that first
declared the virtual destructor.

We need to change the adjustment in both the prologue and the vdtor call
setup.

Reviewers: timurrrr

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2821

llvm-svn: 201612
2014-02-18 22:51:52 +00:00

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// RUN: %clang_cc1 -emit-llvm %s -o - -mconstructor-aliases -triple=i386-pc-win32 -fno-rtti > %t
// RUN: FileCheck %s < %t
// vftables are emitted very late, so do another pass to try to keep the checks
// in source order.
// RUN: FileCheck --check-prefix DTORS %s < %t
// RUN: FileCheck --check-prefix DTORS2 %s < %t
// RUN: FileCheck --check-prefix DTORS3 %s < %t
//
// RUN: %clang_cc1 -emit-llvm %s -o - -mconstructor-aliases -triple=x86_64-pc-win32 -fno-rtti | FileCheck --check-prefix DTORS-X64 %s
namespace basic {
class A {
public:
A() { }
~A();
};
void no_constructor_destructor_infinite_recursion() {
A a;
// CHECK: define linkonce_odr x86_thiscallcc %"class.basic::A"* @"\01??0A@basic@@QAE@XZ"(%"class.basic::A"* returned %this)
// CHECK: [[THIS_ADDR:%[.0-9A-Z_a-z]+]] = alloca %"class.basic::A"*, align 4
// CHECK-NEXT: store %"class.basic::A"* %this, %"class.basic::A"** [[THIS_ADDR]], align 4
// CHECK-NEXT: [[T1:%[.0-9A-Z_a-z]+]] = load %"class.basic::A"** [[THIS_ADDR]]
// CHECK-NEXT: ret %"class.basic::A"* [[T1]]
// CHECK-NEXT: }
}
A::~A() {
// Make sure that the destructor doesn't call itself:
// CHECK: define {{.*}} @"\01??1A@basic@@QAE@XZ"
// CHECK-NOT: call void @"\01??1A@basic@@QAE@XZ"
// CHECK: ret
}
struct B {
B();
};
// Tests that we can define constructors outside the class (PR12784).
B::B() {
// CHECK: define x86_thiscallcc %"struct.basic::B"* @"\01??0B@basic@@QAE@XZ"(%"struct.basic::B"* returned %this)
// CHECK: ret
}
struct C {
virtual ~C() {
// DTORS: define linkonce_odr x86_thiscallcc void @"\01??_GC@basic@@UAEPAXI@Z"(%"struct.basic::C"* %this, i32 %should_call_delete)
// DTORS: store i32 %should_call_delete, i32* %[[SHOULD_DELETE_VAR:[0-9a-z._]+]], align 4
// DTORS: %[[SHOULD_DELETE_VALUE:[0-9a-z._]+]] = load i32* %[[SHOULD_DELETE_VAR]]
// DTORS: call x86_thiscallcc void @"\01??1C@basic@@UAE@XZ"(%"struct.basic::C"* %[[THIS:[0-9a-z]+]])
// DTORS-NEXT: %[[CONDITION:[0-9]+]] = icmp eq i32 %[[SHOULD_DELETE_VALUE]], 0
// DTORS-NEXT: br i1 %[[CONDITION]], label %[[CONTINUE_LABEL:[0-9a-z._]+]], label %[[CALL_DELETE_LABEL:[0-9a-z._]+]]
//
// DTORS: [[CALL_DELETE_LABEL]]
// DTORS-NEXT: %[[THIS_AS_VOID:[0-9a-z]+]] = bitcast %"struct.basic::C"* %[[THIS]] to i8*
// DTORS-NEXT: call void @"\01??3@YAXPAX@Z"(i8* %[[THIS_AS_VOID]])
// DTORS-NEXT: br label %[[CONTINUE_LABEL]]
//
// DTORS: [[CONTINUE_LABEL]]
// DTORS-NEXT: ret void
// Check that we do the mangling correctly on x64.
// DTORS-X64: @"\01??_GC@basic@@UEAAPEAXI@Z"
}
virtual void foo();
};
// Emits the vftable in the output.
void C::foo() {}
void check_vftable_offset() {
C c;
// The vftable pointer should point at the beginning of the vftable.
// CHECK: [[THIS_PTR:%[0-9]+]] = bitcast %"struct.basic::C"* {{.*}} to [2 x i8*]**
// CHECK: store [2 x i8*]* @"\01??_7C@basic@@6B@", [2 x i8*]** [[THIS_PTR]]
}
void call_complete_dtor(C *obj_ptr) {
// CHECK: define void @"\01?call_complete_dtor@basic@@YAXPAUC@1@@Z"(%"struct.basic::C"* %obj_ptr)
obj_ptr->~C();
// CHECK: %[[OBJ_PTR_VALUE:.*]] = load %"struct.basic::C"** %{{.*}}, align 4
// CHECK-NEXT: %[[PVTABLE:.*]] = bitcast %"struct.basic::C"* %[[OBJ_PTR_VALUE]] to void (%"struct.basic::C"*, i32)***
// CHECK-NEXT: %[[VTABLE:.*]] = load void (%"struct.basic::C"*, i32)*** %[[PVTABLE]]
// CHECK-NEXT: %[[PVDTOR:.*]] = getelementptr inbounds void (%"struct.basic::C"*, i32)** %[[VTABLE]], i64 0
// CHECK-NEXT: %[[VDTOR:.*]] = load void (%"struct.basic::C"*, i32)** %[[PVDTOR]]
// CHECK-NEXT: call x86_thiscallcc void %[[VDTOR]](%"struct.basic::C"* %[[OBJ_PTR_VALUE]], i32 0)
// CHECK-NEXT: ret void
}
void call_deleting_dtor(C *obj_ptr) {
// CHECK: define void @"\01?call_deleting_dtor@basic@@YAXPAUC@1@@Z"(%"struct.basic::C"* %obj_ptr)
delete obj_ptr;
// CHECK: %[[OBJ_PTR_VALUE:.*]] = load %"struct.basic::C"** %{{.*}}, align 4
// CHECK: br i1 {{.*}}, label %[[DELETE_NULL:.*]], label %[[DELETE_NOTNULL:.*]]
// CHECK: [[DELETE_NOTNULL]]
// CHECK-NEXT: %[[PVTABLE:.*]] = bitcast %"struct.basic::C"* %[[OBJ_PTR_VALUE]] to void (%"struct.basic::C"*, i32)***
// CHECK-NEXT: %[[VTABLE:.*]] = load void (%"struct.basic::C"*, i32)*** %[[PVTABLE]]
// CHECK-NEXT: %[[PVDTOR:.*]] = getelementptr inbounds void (%"struct.basic::C"*, i32)** %[[VTABLE]], i64 0
// CHECK-NEXT: %[[VDTOR:.*]] = load void (%"struct.basic::C"*, i32)** %[[PVDTOR]]
// CHECK-NEXT: call x86_thiscallcc void %[[VDTOR]](%"struct.basic::C"* %[[OBJ_PTR_VALUE]], i32 1)
// CHECK: ret void
}
struct D {
static int foo();
D() {
static int ctor_static = foo();
// CHECK that the static in the ctor gets mangled correctly:
// CHECK: @"\01?ctor_static@?1???0D@basic@@QAE@XZ@4HA"
}
~D() {
static int dtor_static = foo();
// CHECK that the static in the dtor gets mangled correctly:
// CHECK: @"\01?dtor_static@?1???1D@basic@@QAE@XZ@4HA"
}
};
void use_D() { D c; }
} // end namespace basic
namespace dtor_in_second_nvbase {
struct A {
virtual void f(); // A needs vftable to be primary.
};
struct B {
virtual ~B();
};
struct C : A, B {
virtual ~C();
};
C::~C() {
// CHECK-LABEL: define x86_thiscallcc void @"\01??1C@dtor_in_second_nvbase@@UAE@XZ"
// CHECK: (%"struct.dtor_in_second_nvbase::C"* %this)
// No this adjustment!
// CHECK-NOT: getelementptr
// CHECK: load %"struct.dtor_in_second_nvbase::C"** %{{.*}}
// Now we this-adjust before calling ~B.
// CHECK: bitcast %"struct.dtor_in_second_nvbase::C"* %{{.*}} to i8*
// CHECK: getelementptr inbounds i8* %{{.*}}, i64 4
// CHECK: bitcast i8* %{{.*}} to %"struct.dtor_in_second_nvbase::B"*
// CHECK: call x86_thiscallcc void @"\01??1B@dtor_in_second_nvbase@@UAE@XZ"
// CHECK: (%"struct.dtor_in_second_nvbase::B"* %{{.*}})
// CHECK: ret void
}
void foo() {
C c;
}
// DTORS2-LABEL: define weak x86_thiscallcc void @"\01??_EC@dtor_in_second_nvbase@@W3AEPAXI@Z"
// DTORS2: (%"struct.dtor_in_second_nvbase::C"* %this, i32 %should_call_delete)
// Do an adjustment from B* to C*.
// DTORS2: getelementptr i8* %{{.*}}, i32 -4
// DTORS2: bitcast i8* %{{.*}} to %"struct.dtor_in_second_nvbase::C"*
// DTORS2: call x86_thiscallcc void @"\01??_GC@dtor_in_second_nvbase@@UAEPAXI@Z"
// DTORS2: ret void
}
namespace test2 {
// Just like dtor_in_second_nvbase, except put that in a vbase of a diamond.
// C's dtor is in the non-primary base.
struct A { virtual void f(); };
struct B { virtual ~B(); };
struct C : A, B { virtual ~C(); int c; };
// Diamond hierarchy, with C as the shared vbase.
struct D : virtual C { int d; };
struct E : virtual C { int e; };
struct F : D, E { ~F(); int f; };
F::~F() {
// CHECK-LABEL: define x86_thiscallcc void @"\01??1F@test2@@UAE@XZ"(%"struct.test2::F"*)
// Do an adjustment from C vbase subobject to F as though F was the
// complete type.
// CHECK: getelementptr inbounds i8* %{{.*}}, i32 -20
// CHECK: bitcast i8* %{{.*}} to %"struct.test2::F"*
// CHECK: store %"struct.test2::F"*
}
void foo() {
F f;
}
// DTORS3-LABEL: define linkonce_odr x86_thiscallcc void @"\01??_DF@test2@@UAE@XZ"
// Do an adjustment from C* to F*.
// DTORS3: getelementptr i8* %{{.*}}, i32 20
// DTORS3: bitcast i8* %{{.*}} to %"struct.test2::F"*
// DTORS3: call x86_thiscallcc void @"\01??1F@test2@@UAE@XZ"
// DTORS3: ret void
}
namespace constructors {
struct A {
A() {}
};
struct B : A {
B();
~B();
};
B::B() {
// CHECK: define x86_thiscallcc %"struct.constructors::B"* @"\01??0B@constructors@@QAE@XZ"(%"struct.constructors::B"* returned %this)
// CHECK: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
// CHECK: ret
}
struct C : virtual A {
C();
};
C::C() {
// CHECK: define x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* returned %this, i32 %is_most_derived)
// TODO: make sure this works in the Release build too;
// CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
// CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
// CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
// CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
//
// CHECK: [[INIT_VBASES]]
// CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::C"* %{{.*}} to i8*
// CHECK-NEXT: %[[vbptr_off:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
// CHECK-NEXT: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to [2 x i32]**
// CHECK-NEXT: store [2 x i32]* @"\01??_8C@constructors@@7B@", [2 x i32]** %[[vbptr]]
// CHECK-NEXT: bitcast %"struct.constructors::C"* %{{.*}} to i8*
// CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
// CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
// CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
// CHECK-NEXT: br label %[[SKIP_VBASES]]
//
// CHECK: [[SKIP_VBASES]]
// Class C does not define or override methods, so shouldn't change the vfptr.
// CHECK-NOT: @"\01??_7C@constructors@@6B@"
// CHECK: ret
}
void create_C() {
C c;
// CHECK: define void @"\01?create_C@constructors@@YAXXZ"()
// CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %c, i32 1)
// CHECK: ret
}
struct D : C {
D();
};
D::D() {
// CHECK: define x86_thiscallcc %"struct.constructors::D"* @"\01??0D@constructors@@QAE@XZ"(%"struct.constructors::D"* returned %this, i32 %is_most_derived) unnamed_addr
// CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
// CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
// CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
// CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
//
// CHECK: [[INIT_VBASES]]
// CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::D"* %{{.*}} to i8*
// CHECK-NEXT: %[[vbptr_off:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
// CHECK-NEXT: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to [2 x i32]**
// CHECK-NEXT: store [2 x i32]* @"\01??_8D@constructors@@7B@", [2 x i32]** %[[vbptr]]
// CHECK-NEXT: bitcast %"struct.constructors::D"* %{{.*}} to i8*
// CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
// CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
// CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
// CHECK-NEXT: br label %[[SKIP_VBASES]]
//
// CHECK: [[SKIP_VBASES]]
// CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %{{.*}}, i32 0)
// CHECK: ret
}
struct E : virtual C {
E();
};
E::E() {
// CHECK: define x86_thiscallcc %"struct.constructors::E"* @"\01??0E@constructors@@QAE@XZ"(%"struct.constructors::E"* returned %this, i32 %is_most_derived) unnamed_addr
// CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
// CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
// CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
// CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
//
// CHECK: [[INIT_VBASES]]
// CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::E"* %{{.*}} to i8*
// CHECK-NEXT: %[[offs:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
// CHECK-NEXT: %[[vbptr_E:.*]] = bitcast i8* %[[offs]] to [3 x i32]**
// CHECK-NEXT: store [3 x i32]* @"\01??_8E@constructors@@7B01@@", [3 x i32]** %[[vbptr_E]]
// CHECK-NEXT: %[[offs:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 4
// CHECK-NEXT: %[[vbptr_C:.*]] = bitcast i8* %[[offs]] to [2 x i32]**
// CHECK-NEXT: store [2 x i32]* @"\01??_8E@constructors@@7BC@1@@", [2 x i32]** %[[vbptr_C]]
// CHECK-NEXT: bitcast %"struct.constructors::E"* %{{.*}} to i8*
// CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
// CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
// CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
// CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %{{.*}}, i32 0)
// CHECK-NEXT: br label %[[SKIP_VBASES]]
//
// CHECK: [[SKIP_VBASES]]
// CHECK: ret
}
// PR16735 - even abstract classes should have a constructor emitted.
struct F {
F();
virtual void f() = 0;
};
F::F() {}
// CHECK: define x86_thiscallcc %"struct.constructors::F"* @"\01??0F@constructors@@QAE@XZ"
} // end namespace constructors
namespace dtors {
struct A {
~A();
};
void call_nv_complete(A *a) {
a->~A();
// CHECK: define void @"\01?call_nv_complete@dtors@@YAXPAUA@1@@Z"
// CHECK: call x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
// CHECK: ret
}
// CHECK: declare x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
// Now try some virtual bases, where we need the complete dtor.
struct B : virtual A { ~B(); };
struct C : virtual A { ~C(); };
struct D : B, C { ~D(); };
void call_vbase_complete(D *d) {
d->~D();
// CHECK: define void @"\01?call_vbase_complete@dtors@@YAXPAUD@1@@Z"
// CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
// CHECK: ret
}
// The complete dtor should call the base dtors for D and the vbase A (once).
// CHECK: define linkonce_odr x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"
// CHECK-NOT: call
// CHECK: call x86_thiscallcc void @"\01??1D@dtors@@QAE@XZ"
// CHECK-NOT: call
// CHECK: call x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
// CHECK-NOT: call
// CHECK: ret
void destroy_d_complete() {
D d;
// CHECK: define void @"\01?destroy_d_complete@dtors@@YAXXZ"
// CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
// CHECK: ret
}
// FIXME: Clang manually inlines the deletion, so we don't get a call to the
// deleting dtor (_G). The only way to call deleting dtors currently is through
// a vftable.
void call_nv_deleting_dtor(D *d) {
delete d;
// CHECK: define void @"\01?call_nv_deleting_dtor@dtors@@YAXPAUD@1@@Z"
// CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
// CHECK: call void @"\01??3@YAXPAX@Z"
// CHECK: ret
}
}
namespace test1 {
struct A { };
struct B : virtual A {
B(int *a);
B(const char *a, ...);
__cdecl B(short *a);
};
B::B(int *a) {}
B::B(const char *a, ...) {}
B::B(short *a) {}
// CHECK: define x86_thiscallcc %"struct.test1::B"* @"\01??0B@test1@@QAE@PAH@Z"
// CHECK: (%"struct.test1::B"* returned %this, i32* %a, i32 %is_most_derived)
// CHECK: define %"struct.test1::B"* @"\01??0B@test1@@QAA@PBDZZ"
// CHECK: (%"struct.test1::B"* returned %this, i32 %is_most_derived, i8* %a, ...)
// FIXME: This should be x86_thiscallcc. MSVC ignores explicit CCs on structors.
// CHECK: define %"struct.test1::B"* @"\01??0B@test1@@QAA@PAF@Z"
// CHECK: (%"struct.test1::B"* returned %this, i16* %a, i32 %is_most_derived)
void construct_b() {
int a;
B b1(&a);
B b2("%d %d", 1, 2);
}
// CHECK-LABEL: define void @"\01?construct_b@test1@@YAXXZ"()
// CHECK: call x86_thiscallcc %"struct.test1::B"* @"\01??0B@test1@@QAE@PAH@Z"
// CHECK: (%"struct.test1::B"* {{.*}}, i32* {{.*}}, i32 1)
// CHECK: call %"struct.test1::B"* (%"struct.test1::B"*, i32, i8*, ...)* @"\01??0B@test1@@QAA@PBDZZ"
// CHECK: (%"struct.test1::B"* {{.*}}, i32 1, i8* {{.*}}, i32 1, i32 2)
}
// Dtor thunks for classes in anonymous namespaces should be internal, not
// linkonce_odr.
namespace {
struct A {
virtual ~A() { }
};
}
void *getA() {
return (void*)new A();
}
// CHECK: define internal x86_thiscallcc void @"\01??_GA@?A@@UAEPAXI@Z"
// CHECK: (%"struct.<anonymous namespace>::A"* %this, i32 %should_call_delete)
// CHECK: define internal x86_thiscallcc void @"\01??1A@?A@@UAE@XZ"
// CHECK: (%"struct.<anonymous namespace>::A"* %this)
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