// RUN: %clang_cc1 -fno-rtti -emit-llvm -fdump-vtable-layouts %s -o %t.ll -triple=i386-pc-win32 > %t
// RUN: FileCheck %s < %t
// RUN: FileCheck --check-prefix=MANGLING %s < %t.ll
// For now, just make sure x86_64 doesn't crash.
// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -fdump-vtable-layouts %s -triple=x86_64-pc-win32 > /dev/null
struct V1 {
virtual void f();
virtual ~V1();
};
struct V2 {
virtual void f();
virtual ~V2();
int v;
};
struct Z {
virtual void g();
virtual ~Z();
int x;
};
struct V3 : Z, V2 {
};
struct V4 : Z, V1, V2 {
int y;
};
void use_somewhere_else(void*);
namespace simple {
// In case of a single-layer virtual inheritance, the "this" adjustment for a
// virtual method is done statically:
// struct A {
// virtual void f(); // Expects "(A*)this" in ECX
// };
// struct B : virtual A {
// virtual void f(); // Expects "(char*)(B*)this + 12" in ECX
// virtual ~B(); // Might call f()
// };
//
// If a class overrides a virtual function of its base and has a non-trivial
// ctor/dtor that call(s) the virtual function (or may escape "this" to some
// code that might call it), a virtual adjustment might be needed in case the
// current class layout and the most derived class layout are different.
// This is done using vtordisp thunks.
//
// A simple vtordisp{x,y} thunk for Method@Class is something like:
// sub ecx, [ecx+x] // apply the vtordisp adjustment
// sub ecx, y // apply the subobject adjustment, if needed.
// jmp Method@Class
struct A : virtual V1 {
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' (2 entries).
// CHECK-NEXT: 0 | void simple::A::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-NEXT: 1 | simple::A::~A() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'simple::A::~A()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, 0 non-virtual]
virtual void f();
// MANGLING-DAG: @"?f@A@simple@@$4PPPPPPPM@A@AEXXZ"
virtual ~A();
// MANGLING-DAG: @"??_EA@simple@@$4PPPPPPPM@A@AEPAXI@Z"
};
A a;
void use(A *obj) { obj->f(); }
struct B : virtual V3 {
// CHECK-LABEL: VFTable for 'Z' in 'V3' in 'simple::B' (2 entries).
// CHECK-NEXT: 0 | void Z::g()
// CHECK-NEXT: 1 | simple::B::~B() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'simple::B::~B()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: VFTable for 'V2' in 'V3' in 'simple::B' (2 entries).
// CHECK-NEXT: 0 | void simple::B::f()
// CHECK-NEXT: [this adjustment: vtordisp at -12, 0 non-virtual]
// CHECK-NEXT: 1 | simple::B::~B() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
// CHECK-LABEL: Thunks for 'simple::B::~B()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -12, -8 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::B::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -12, 0 non-virtual]
// FIXME: The vtordisp thunk should only get emitted for a constructor
// if "this" leaves scope.
B() { use_somewhere_else(this); }
virtual void f();
// MANGLING-DAG: @"?f@B@simple@@$4PPPPPPPE@A@AEXXZ"
// Has an implicit destructor.
// MANGLING-DAG: @"??_EB@simple@@$4PPPPPPPE@7AEPAXI@Z"
// MANGLING-DAG: @"??_EB@simple@@$4PPPPPPPM@A@AEPAXI@Z"
};
B b;
void use(B *obj) { obj->f(); }
struct C : virtual V4 {
// CHECK-LABEL: VFTable for 'Z' in 'V4' in 'simple::C' (2 entries).
// CHECK-NEXT: 0 | void Z::g()
// CHECK-NEXT: 1 | simple::C::~C() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'simple::C::~C()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: VFTable for 'V1' in 'V4' in 'simple::C' (2 entries).
// CHECK-NEXT: 0 | void simple::C::f()
// CHECK-NEXT: [this adjustment: vtordisp at -12, 0 non-virtual]
// CHECK-NEXT: 1 | simple::C::~C() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
// CHECK-LABEL: Thunks for 'simple::C::~C()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -12, -8 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::C::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -12, 0 non-virtual]
// CHECK-LABEL: VFTable for 'V2' in 'V4' in 'simple::C' (2 entries).
// CHECK-NEXT: 0 | void simple::C::f()
// CHECK-NEXT: [this adjustment: vtordisp at -16, -4 non-virtual]
// CHECK-NEXT: 1 | simple::C::~C() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -16, -12 non-virtual]
// CHECK-LABEL: Thunks for 'simple::C::~C()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -16, -12 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::C::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -16, -4 non-virtual]
int x;
virtual void f();
// MANGLING-DAG: @"?f@C@simple@@$4PPPPPPPA@3AEXXZ"
// MANGLING-DAG: @"?f@C@simple@@$4PPPPPPPE@A@AEXXZ"
virtual ~C();
// MANGLING-DAG: @"??_EC@simple@@$4PPPPPPPA@M@AEPAXI@Z"
// MANGLING-DAG: @"??_EC@simple@@$4PPPPPPPE@7AEPAXI@Z"
// MANGLING-DAG: @"??_EC@simple@@$4PPPPPPPM@A@AEPAXI@Z"
};
C c;
void use(C *obj) { obj->f(); }
class D : B {
// CHECK-LABEL: VFTable for 'V2' in 'V3' in 'simple::B' in 'simple::D' (2 entries).
// CHECK-NEXT: 0 | void simple::B::f()
// CHECK-NEXT: [this adjustment: vtordisp at -12, -4 non-virtual]
// CHECK-NEXT: 1 | simple::D::~D() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
D();
int z;
// MANGLING-DAG: @"?f@B@simple@@$4PPPPPPPE@3AEXXZ"
};
D::D() {}
struct E : V3 {
virtual void f();
};
struct F : virtual E {
// CHECK-LABEL: VFTable for 'Z' in 'V3' in 'simple::E' in 'simple::F' (2 entries).
// CHECK-NEXT: 0 | void simple::F::g()
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-NEXT: 1 | simple::F::~F() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: VFTable for 'V2' in 'V3' in 'simple::E' in 'simple::F' (2 entries).
// CHECK-NEXT: 0 | void simple::E::f()
// CHECK-NEXT: 1 | simple::F::~F() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
F();
virtual void g(); // Force a vtordisp.
int f;
// MANGLING-DAG: @"?g@F@simple@@$4PPPPPPPM@A@AEXXZ"{{.*}}??_EF@simple@@$4PPPPPPPM@A@AEPAXI@Z
// MANGLING-DAG: ?f@E@simple@@UAEXXZ{{.*}}??_EF@simple@@$4PPPPPPPE@7AEPAXI@Z
};
F::F() {}
struct G : F {
// CHECK-LABEL: VFTable for 'Z' in 'V3' in 'simple::E' in 'simple::F' in 'simple::G' (2 entries).
// CHECK-NEXT: 0 | void simple::F::g()
// CHECK-NEXT: [this adjustment: vtordisp at -4, -4 non-virtual]
// CHECK-NEXT: 1 | simple::G::~G() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: VFTable for 'V2' in 'V3' in 'simple::E' in 'simple::F' in 'simple::G' (2 entries).
// CHECK-NEXT: 0 | void simple::E::f()
// CHECK-NEXT: 1 | simple::G::~G() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
G();
int g;
// MANGLING-DAG: @"?g@F@simple@@$4PPPPPPPM@3AEXXZ"{{.*}}@"??_EG@simple@@$4PPPPPPPM@A@AEPAXI@Z"
// MANGLING-DAG: @"?f@E@simple@@UAEXXZ"{{.*}}@"??_EG@simple@@$4PPPPPPPE@7AEPAXI@Z"
};
G::G() {}
}
namespace extended {
// If a virtual function requires vtordisp adjustment and the final overrider
// is defined in another virtual base of the most derived class,
// we need to know two vbase offsets.
// In this case, we should use the extended form of vtordisp thunks, called
// vtordispex thunks.
//
// vtordispex{x,y,z,w} thunk for Method@Class is something like:
// sub ecx, [ecx+z] // apply the vtordisp adjustment
// sub ecx, x // jump to the vbptr of the most derived class
// mov eax, [ecx] // load the vbtable address
// add ecx, [eax+y] // lookup the final overrider's vbase offset
// add ecx, w // apphy the subobject offset if needed
// jmp Method@Class
struct A : virtual simple::A {
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' in 'extended::A' (2 entries).
// CHECK-NEXT: 0 | void simple::A::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// CHECK-NEXT: 1 | extended::A::~A() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// `vtordispex{8,8,4294967292,8}'
// MANGLING-DAG: @"?f@A@simple@@$R477PPPPPPPM@7AEXXZ"
virtual ~A();
// vtordisp{4294967292,0}
// MANGLING-DAG: @"??_EA@extended@@$4PPPPPPPM@A@AEPAXI@Z"
};
A a;
void use(A *obj) { delete obj; }
struct B : virtual simple::A {
// This class has an implicit dtor. Vdtors don't require vtordispex thunks
// as the most derived class always has an implicit dtor,
// which is a final overrider.
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' in 'extended::B' (2 entries).
// ...
// CHECK: 1 | extended::B::~B() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// vtordisp{4294967292,0}
// MANGLING-DAG: @"??_EB@extended@@$4PPPPPPPM@A@AEPAXI@Z"
};
B b;
void use(B *obj) { delete obj; }
struct C : virtual simple::A {
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' in 'extended::C' (2 entries).
// CHECK-NEXT: 0 | void simple::A::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 12 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 12 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// `vtordispex{12,8,4294967292,8}'
// MANGLING-DAG: @"?f@A@simple@@$R4M@7PPPPPPPM@7AEXXZ"
int x;
virtual ~C();
// MANGLING-DAG: @"??_EC@extended@@$4PPPPPPPM@A@AEPAXI@Z"
};
C c;
void use(C *obj) { delete obj; }
struct D : virtual V2 {
virtual void f();
virtual ~D();
int x;
};
struct E : virtual D {
// CHECK-LABEL: VFTable for 'V2' in 'extended::D' in 'extended::E' (2 entries).
// CHECK-NEXT: 0 | void extended::D::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 12 non-virtual]
// CHECK-LABEL: Thunks for 'void extended::D::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 12 non-virtual]
// `vtordispex{8,8,4294967292,12}'
// MANGLING-DAG: @"?f@D@extended@@$R477PPPPPPPM@M@AEXXZ"
virtual ~E();
// MANGLING-DAG: @"??_EE@extended@@$4PPPPPPPM@A@AEPAXI@Z"
};
E e;
void use(E *obj) { delete obj; }
struct F : virtual Z, virtual D {
// CHECK-LABEL: VFTable for 'V2' in 'extended::D' in 'extended::F' (2 entries).
// CHECK-NEXT: 0 | void extended::D::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 20 to the left,
// CHECK-NEXT: vboffset at 12 in the vbtable, 12 non-virtual]
// CHECK-LABEL: Thunks for 'void extended::D::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 20 to the left,
// CHECK-NEXT: vboffset at 12 in the vbtable, 12 non-virtual]
// `vtordispex{20,12,4294967292,12}'
// MANGLING-DAG: @"?f@D@extended@@$R4BE@M@PPPPPPPM@M@AEXXZ"
int x;
virtual ~F();
// MANGLING-DAG: @"??_EF@extended@@$4PPPPPPPM@M@AEPAXI@Z"
};
F f;
void use(F *obj) { delete obj; }
struct G : virtual simple::A {
// CHECK-LABEL: VFTable for 'extended::G' (1 entry).
// CHECK-NEXT: 0 | void extended::G::g()
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' in 'extended::G' (2 entries).
// CHECK-NEXT: 0 | void simple::A::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// CHECK-NEXT: 1 | extended::G::~G() [scalar deleting]
// CHECK-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// Emits a G's own vfptr, thus moving the vbptr in the layout.
virtual void g();
virtual ~G();
// vtordisp{4294967292,0}
// MANGLING-DAG: @"??_EG@extended@@$4PPPPPPPM@A@AEPAXI@Z"
};
G g;
void use(G *obj) { obj->g(); }
struct H : Z, A {
// CHECK-LABEL: VFTable for 'Z' in 'extended::H' (2 entries).
// CHECK-NEXT: 0 | void Z::g()
// CHECK-NEXT: 1 | extended::H::~H() [scalar deleting]
// CHECK-LABEL: VFTable for 'V1' in 'simple::A' in 'extended::A' in 'extended::H' (2 entries).
// CHECK-NEXT: 0 | void simple::A::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::A::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -4, vbptr at 8 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
// MANGLING-DAG: @"?f@A@simple@@$R477PPPPPPPM@7AEXXZ"
// MANGLING-DAG: @"??_EH@extended@@$4PPPPPPPM@BA@AEPAXI@Z"
};
H h;
void use(H *obj) { delete obj; }
}
namespace pr17738 {
// These classes should have vtordispex thunks but MSVS CL miscompiles them.
// Just do the right thing.
struct A : virtual simple::B {
// CHECK-LABEL: VFTable for 'V2' in 'V3' in 'simple::B' in 'pr17738::A' (2 entries).
// CHECK-NEXT: 0 | void simple::B::f()
// CHECK-NEXT: [this adjustment: vtordisp at -12, vbptr at 20 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 16 non-virtual]
// CHECK-LABEL: Thunks for 'void simple::B::f()' (1 entry).
// CHECK-NEXT: 0 | [this adjustment: vtordisp at -12, vbptr at 20 to the left,
// CHECK-NEXT: vboffset at 8 in the vbtable, 16 non-virtual]
// MANGLING-DAG: @"?f@B@simple@@$R4BE@7PPPPPPPE@BA@AEXXZ"
int a;
virtual ~A();
};
A a;
void use(A *obj) { delete obj; }
}
namespace pr19408 {
// In this test, the vptr used to vcall D::f() is located in the A vbase.
// The offset of A in different in C and D, so the D vtordisp thunk should
// adjust "this" so C::f gets the right value.
struct A {
A();
virtual void f();
int a;
};
struct B : virtual A {
B();
int b;
};
struct C : B {
C();
virtual void f();
int c;
};
struct D : C {
// CHECK-LABEL: VFTable for 'pr19408::A' in 'pr19408::B' in 'pr19408::C' in 'pr19408::D' (1 entry).
// CHECK-NEXT: 0 | void pr19408::C::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, -4 non-virtual]
// MANGLING-DAG: @"?f@C@pr19408@@$4PPPPPPPM@3AEXXZ"
D();
int d;
};
D::D() {}
}
namespace access {
struct A {
virtual ~A();
protected:
virtual void prot();
private:
virtual void priv();
};
struct B : virtual A {
virtual ~B();
protected:
virtual void prot();
// MANGLING-DAG: @"?prot@B@access@@$2PPPPPPPM@A@AEXXZ"
private:
virtual void priv();
// MANGLING-DAG: @"?priv@B@access@@$0PPPPPPPM@A@AEXXZ"
};
B b;
struct C : virtual B {
virtual ~C();
// MANGLING-DAG: @"?prot@B@access@@$R277PPPPPPPM@7AEXXZ"
// MANGLING-DAG: @"?priv@B@access@@$R077PPPPPPPM@7AEXXZ"
};
C c;
}
namespace pr19505 {
struct A {
virtual void f();
virtual void z();
};
struct B : A {
virtual void f();
};
struct C : A, B {
virtual void g();
};
struct X : B, virtual C {
X() {}
virtual void g();
// CHECK-LABEL: VFTable for 'pr19505::A' in 'pr19505::B' in 'pr19505::C' in 'pr19505::X' (2 entries).
// CHECK-NEXT: 0 | void pr19505::B::f()
// CHECK-NEXT: 1 | void pr19505::A::z()
// MANGLING-DAG: @"??_7X@pr19505@@6BB@1@@" = {{.*}}@"?f@B@pr19505@@UAEXXZ"
} x;
void build_vftable(X *obj) { obj->g(); }
}
namespace pr19506 {
struct A {
virtual void f();
virtual void g();
};
struct B : A {
virtual void f();
};
struct C : B {};
struct X : C, virtual B {
virtual void g();
X() {}
// CHECK-LABEL: VFTable for 'pr19506::A' in 'pr19506::B' in 'pr19506::X' (2 entries).
// CHECK-NEXT: 0 | void pr19506::B::f()
// CHECK-NEXT: 1 | void pr19506::X::g()
// CHECK-NEXT: [this adjustment: vtordisp at -4, -12 non-virtual]
// MANGLING-DAG: @"??_7X@pr19506@@6BB@1@@" = {{.*}}@"?f@B@pr19506@@UAEXXZ"
} x;
void build_vftable(X *obj) { obj->g(); }
}
namespace pr19519 {
// VS2013 CL miscompiles this, just make sure we don't regress.
struct A {
virtual void f();
virtual void g();
};
struct B : virtual A {
virtual void f();
B();
};
struct C : virtual A {
virtual void g();
};
struct X : B, C {
X();
// CHECK-LABEL: VFTable for 'pr19519::A' in 'pr19519::B' in 'pr19519::X' (2 entries).
// CHECK-NEXT: 0 | void pr19519::B::f()
// CHECK-NEXT: [this adjustment: vtordisp at -4, -4 non-virtual]
// CHECK-NEXT: 1 | void pr19519::C::g()
// CHECK-NEXT: [this adjustment: vtordisp at -4, -4 non-virtual]
// MANGLING-DAG: @"??_7X@pr19519@@6B@" = {{.*}}@"?g@C@pr19519@@$4PPPPPPPM@3AEXXZ"
};
X::X() {}
}
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