324 lines
11 KiB
C++
324 lines
11 KiB
C++
// RUN: %clang_cc1 -fno-rtti -emit-llvm -fdump-vtable-layouts %s -o %t.ll -cxx-abi microsoft -triple=i386-pc-win32 >%t
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// RUN: FileCheck --check-prefix=VTABLE-SIMPLE-A %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-SIMPLE-B %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-SIMPLE-C %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-A %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-B %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-C %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-E %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-F %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-G %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-EXTENDED-H %s < %t
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// RUN: FileCheck --check-prefix=VTABLE-PR17738-A %s < %t
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// RUN: FileCheck --check-prefix=MANGLING %s < %t.ll
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// For now, just make sure x86_64 doesn't crash.
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// RUN: %clang_cc1 -fno-rtti -emit-llvm-only -fdump-vtable-layouts %s -cxx-abi microsoft -triple=x86_64-pc-win32 >/dev/null
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struct V1 {
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virtual void f();
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virtual ~V1();
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};
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struct V2 {
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virtual void f();
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virtual ~V2();
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int v;
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};
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struct Z {
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virtual void g();
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virtual ~Z();
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int x;
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};
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struct V3 : Z, V2 {
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};
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struct V4 : Z, V1, V2 {
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int y;
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};
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void use_somewhere_else(void*);
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namespace simple {
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// In case of a single-layer virtual inheritance, the "this" adjustment is done
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// staically:
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// struct A {
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// virtual void f(); // Expects "(A*)this" in ECX
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// };
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// struct B : virtual A {
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// virtual void f(); // Expects "(char*)(B*)this + 12" in ECX
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// virtual ~B(); // Might call f()
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// };
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//
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// If a class overrides a virtual function of its base and has a non-trivial
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// ctor/dtor that call(s) the virtual function (or may escape "this" to some
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// code that might call it), a virtual adjustment might be needed in case the
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// current class layout and the most derived class layout are different.
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// This is done using vtordisp thunks.
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//
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// A simple vtordisp{A,B} thunk for Method@Class is something like:
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// sub ecx, [ecx+A] // apply the vtordisp adjustment
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// sub ecx, B // apply the subobject adjustment, if needed.
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// jmp Method@Class
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struct A : virtual V1 {
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// VTABLE-SIMPLE-A: VFTable for 'V1' in 'simple::A' (2 entries).
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// VTABLE-SIMPLE-A-NEXT: 0 | void simple::A::f()
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// VTABLE-SIMPLE-A-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// VTABLE-SIMPLE-A-NEXT: 1 | simple::A::~A() [scalar deleting]
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// VTABLE-SIMPLE-A-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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virtual void f();
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// MANGLING-DAG: @"\01?f@A@simple@@$4PPPPPPPM@A@AEXXZ"
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virtual ~A();
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// MANGLING-DAG: @"\01??_EA@simple@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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A a;
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struct B : virtual V3 {
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// VTABLE-SIMPLE-B: VFTable for 'Z' in 'V3' in 'simple::B' (2 entries).
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// VTABLE-SIMPLE-B-NEXT: 0 | void Z::g()
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// VTABLE-SIMPLE-B-NEXT: 1 | simple::B::~B() [scalar deleting]
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// VTABLE-SIMPLE-B-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// VTABLE-SIMPLE-B: VFTable for 'V2' in 'V3' in 'simple::B' (2 entries).
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// VTABLE-SIMPLE-B-NEXT: 0 | void simple::B::f()
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// VTABLE-SIMPLE-B-NEXT: [this adjustment: vtordisp at -12, 0 non-virtual]
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// VTABLE-SIMPLE-B-NEXT: 1 | simple::B::~B() [scalar deleting]
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// VTABLE-SIMPLE-B-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
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// FIXME: The vtordisp thunk should only get emitted for a constructor
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// if "this" leaves scope.
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B() { use_somewhere_else(this); }
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virtual void f();
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// MANGLING-DAG: @"\01?f@B@simple@@$4PPPPPPPE@A@AEXXZ"
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// Has an implicit destructor.
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// MANGLING-DAG: @"\01??_EB@simple@@$4PPPPPPPE@7AEPAXI@Z"
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// MANGLING-DAG: @"\01??_EB@simple@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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B b;
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struct C : virtual V4 {
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// VTABLE-SIMPLE-C: VFTable for 'Z' in 'V4' in 'simple::C' (2 entries).
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// VTABLE-SIMPLE-C-NEXT: 0 | void Z::g()
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// VTABLE-SIMPLE-C-NEXT: 1 | simple::C::~C() [scalar deleting]
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// VTABLE-SIMPLE-C-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// VTABLE-SIMPLE-C: VFTable for 'V1' in 'V4' in 'simple::C' (2 entries).
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// VTABLE-SIMPLE-C-NEXT: 0 | void simple::C::f()
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// VTABLE-SIMPLE-C-NEXT: [this adjustment: vtordisp at -12, 0 non-virtual]
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// VTABLE-SIMPLE-C-NEXT: 1 | simple::C::~C() [scalar deleting]
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// VTABLE-SIMPLE-C-NEXT: [this adjustment: vtordisp at -12, -8 non-virtual]
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// VTABLE-SIMPLE-C: VFTable for 'V2' in 'V4' in 'simple::C' (2 entries).
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// VTABLE-SIMPLE-C-NEXT: 0 | void simple::C::f()
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// VTABLE-SIMPLE-C-NEXT: [this adjustment: vtordisp at -16, -4 non-virtual]
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// VTABLE-SIMPLE-C-NEXT: 1 | simple::C::~C() [scalar deleting]
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// VTABLE-SIMPLE-C-NEXT: [this adjustment: vtordisp at -16, -12 non-virtual]
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int x;
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virtual void f();
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// MANGLING-DAG: @"\01?f@C@simple@@$4PPPPPPPA@3AEXXZ"
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// MANGLING-DAG: @"\01?f@C@simple@@$4PPPPPPPE@A@AEXXZ"
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virtual ~C();
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// MANGLING-DAG: @"\01??_EC@simple@@$4PPPPPPPA@M@AEPAXI@Z"
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// MANGLING-DAG: @"\01??_EC@simple@@$4PPPPPPPE@7AEPAXI@Z"
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// MANGLING-DAG: @"\01??_EC@simple@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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C c;
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}
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namespace extended {
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// If a virtual function requires vtordisp adjustment and the final overrider
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// is defined in another vitual base of the most derived class,
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// we need to know two vbase offsets.
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// In this case, we should use the extended form of vtordisp thunks, called
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// vtordispex thunks.
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//
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// vtordispex{A,B,C,D} thunk for Method@Class is something like:
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// sub ecx, [ecx+C] // apply the vtordisp adjustment
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// sub ecx, A // jump to the vbtable of the most derived class
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// mov eax, [ecx] // load the vbtable address
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// add ecx, [eax+B] // lookup the final overrider's vbase offset
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// add ecx, D // apphy the subobject offset if needed
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// jmp Method@Class
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struct A : virtual simple::A {
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// VTABLE-EXTENDED-A: VFTable for 'V1' in 'simple::A' in 'extended::A' (2 entries).
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// VTABLE-EXTENDED-A-NEXT: 0 | void simple::A::f()
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// VTABLE-EXTENDED-A-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
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// VTABLE-EXTENDED-A-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
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// VTABLE-EXTENDED-A-NEXT: 1 | extended::A::~A() [scalar deleting]
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// VTABLE-EXTENDED-A-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// `vtordispex{8,8,4294967292,8}'
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// MANGLING-DAG: @"\01?f@A@simple@@$R477PPPPPPPM@7AEXXZ"
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virtual ~A();
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// vtordisp{4294967292,0}
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// MANGLING-DAG: @"\01??_EA@extended@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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A a;
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struct B : virtual simple::A {
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// This class has an implicit dtor. Vdtors don't require vtordispex thunks
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// as the most derived class always has an implicit dtor,
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// which is a final overrider.
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// VTABLE-EXTENDED-B: VFTable for 'V1' in 'simple::A' in 'extended::B' (2 entries).
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// ...
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// VTABLE-EXTENDED-B: 1 | extended::B::~B() [scalar deleting]
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// VTABLE-EXTENDED-B-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// vtordisp{4294967292,0}
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// MANGLING-DAG: @"\01??_EB@extended@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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B b;
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struct C : virtual simple::A {
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// VTABLE-EXTENDED-C: VFTable for 'V1' in 'simple::A' in 'extended::C' (2 entries).
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// VTABLE-EXTENDED-C-NEXT: 0 | void simple::A::f()
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// VTABLE-EXTENDED-C-NEXT: [this adjustment: vtordisp at -4, vbptr at 12 to the left,
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// VTABLE-EXTENDED-C-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
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// `vtordispex{12,8,4294967292,8}'
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// MANGLING-DAG: @"\01?f@A@simple@@$R4M@7PPPPPPPM@7AEXXZ"
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int x;
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virtual ~C();
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// MANGLING-DAG: @"\01??_EC@extended@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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C c;
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struct D : virtual V2 {
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virtual void f();
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virtual ~D();
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int x;
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};
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struct E : virtual D {
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// VTABLE-EXTENDED-E: VFTable for 'V2' in 'extended::D' in 'extended::E' (2 entries).
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// VTABLE-EXTENDED-E-NEXT: 0 | void extended::D::f()
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// VTABLE-EXTENDED-E-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
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// VTABLE-EXTENDED-E-NEXT: vboffset at 8 in the vbtable, 12 non-virtual]
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// `vtordispex{8,8,4294967292,12}'
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// MANGLING-DAG: @"\01?f@D@extended@@$R477PPPPPPPM@M@AEXXZ"
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virtual ~E();
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// MANGLING-DAG: @"\01??_EE@extended@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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E e;
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struct F : virtual Z, virtual D {
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// VTABLE-EXTENDED-F: VFTable for 'V2' in 'extended::D' in 'extended::F' (2 entries).
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// VTABLE-EXTENDED-F-NEXT: 0 | void extended::D::f()
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// VTABLE-EXTENDED-F-NEXT: [this adjustment: vtordisp at -4, vbptr at 20 to the left,
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// VTABLE-EXTENDED-F-NEXT: vboffset at 12 in the vbtable, 12 non-virtual]
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// `vtordispex{20,12,4294967292,12}'
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// MANGLING-DAG: @"\01?f@D@extended@@$R4BE@M@PPPPPPPM@M@AEXXZ"
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int x;
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virtual ~F();
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// MANGLING-DAG: @"\01??_EF@extended@@$4PPPPPPPM@M@AEPAXI@Z"
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};
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F f;
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struct G : virtual simple::A {
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// VTABLE-EXTENDED-G: VFTable for 'extended::G' (1 entries).
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// VTABLE-EXTENDED-G-NEXT: 0 | void extended::G::g()
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// VTABLE-EXTENDED-G: VFTable for 'V1' in 'simple::A' in 'extended::G' (2 entries).
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// VTABLE-EXTENDED-G-NEXT: 0 | void simple::A::f()
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// VTABLE-EXTENDED-G-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
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// VTABLE-EXTENDED-G-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
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// VTABLE-EXTENDED-G-NEXT: 1 | extended::G::~G() [scalar deleting]
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// VTABLE-EXTENDED-G-NEXT: [this adjustment: vtordisp at -4, 0 non-virtual]
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// Emits a G's own vfptr, thus moving the vbptr in the layout.
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virtual void g();
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virtual ~G();
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// vtordisp{4294967292,0}
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// MANGLING-DAG: @"\01??_EG@extended@@$4PPPPPPPM@A@AEPAXI@Z"
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};
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G g;
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struct H : Z, A {
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// VTABLE-EXTENDED-H: VFTable for 'Z' in 'extended::H' (2 entries).
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// VTABLE-EXTENDED-H-NEXT: 0 | void Z::g()
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// VTABLE-EXTENDED-H-NEXT: 1 | extended::H::~H() [scalar deleting]
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// VTABLE-EXTENDED-H: VFTable for 'V1' in 'simple::A' in 'extended::A' in 'extended::H' (2 entries).
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// VTABLE-EXTENDED-H-NEXT: 0 | void simple::A::f()
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// VTABLE-EXTENDED-H-NEXT: [this adjustment: vtordisp at -4, vbptr at 8 to the left,
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// VTABLE-EXTENDED-H-NEXT: vboffset at 8 in the vbtable, 8 non-virtual]
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// MANGLING-DAG: @"\01?f@A@simple@@$R477PPPPPPPM@7AEXXZ"
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// MANGLING-DAG: @"\01??_EH@extended@@$4PPPPPPPM@BA@AEPAXI@Z"
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};
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H h;
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}
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namespace pr17738 {
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// These classes should have vtordispex thunks but MSVS CL miscompiles them.
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// Just do the right thing.
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struct A : virtual simple::B {
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// VTABLE-PR17738-A: VFTable for 'V2' in 'V3' in 'simple::B' in 'pr17738::A' (2 entries).
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// VTABLE-PR17738-A-NEXT: 0 | void simple::B::f()
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// VTABLE-PR17738-A-NEXT: [this adjustment: vtordisp at -12, vbptr at 20 to the left,
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// VTABLE-PR17738-A-NEXT: vboffset at 8 in the vbtable, 16 non-virtual]
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// MANGLING-DAG: @"\01?f@B@simple@@$R4BE@7PPPPPPPE@BA@AEXXZ"
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int a;
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virtual ~A();
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};
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A a;
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}
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namespace access {
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struct A {
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virtual ~A();
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protected:
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virtual void prot();
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private:
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virtual void priv();
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};
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struct B : virtual A {
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virtual ~B();
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protected:
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virtual void prot();
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// MANGLING-DAG: @"\01?prot@B@access@@$2PPPPPPPM@A@AEXXZ"
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private:
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virtual void priv();
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// MANGLING-DAG: @"\01?priv@B@access@@$0PPPPPPPM@A@AEXXZ"
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};
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B b;
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struct C : virtual B {
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virtual ~C();
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// MANGLING-DAG: @"\01?prot@B@access@@$R277PPPPPPPM@7AEXXZ"
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// MANGLING-DAG: @"\01?priv@B@access@@$R077PPPPPPPM@7AEXXZ"
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};
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C c;
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}
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