// RUN: %clang_cc1 %s -fno-rtti -std=c++11 -Wno-inaccessible-base -triple=i386-pc-win32 -emit-llvm -o %t
// RUN: FileCheck %s < %t
// RUN: FileCheck --check-prefix=CHECK2 %s < %t
// For now, just make sure x86_64 doesn't crash.
// RUN: %clang_cc1 %s -fno-rtti -std=c++11 -Wno-inaccessible-base -triple=x86_64-pc-win32 -emit-llvm -o %t
struct VBase {
virtual ~VBase();
virtual void foo();
virtual void bar();
int field;
};
struct B : virtual VBase {
B();
virtual ~B();
virtual void foo();
virtual void bar();
};
B::B() {
// CHECK-LABEL: define dso_local x86_thiscallcc noundef ptr @"??0B@@QAE@XZ"
// CHECK: %[[THIS:.*]] = load ptr, ptr
// CHECK: br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
// Don't check the INIT_VBASES case as it's covered by the ctor tests.
// CHECK: %[[SKIP_VBASES]]
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 0
// ...
// CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 %{{.*}}
// CHECK: store ptr @"??_7B@@6B@", ptr %[[VFPTR_i8]]
// Initialize vtorDisp:
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 0
// ...
// CHECK: %[[VBASE_OFFSET:.*]] = add nsw i32 0, %{{.*}}
// CHECK: %[[VTORDISP_VAL:.*]] = sub i32 %[[VBASE_OFFSET]], 8
// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 %[[VBASE_OFFSET]]
// CHECK: %[[VTORDISP_i8:.*]] = getelementptr i8, ptr %[[VBASE_i8]], i32 -4
// CHECK: store i32 %[[VTORDISP_VAL]], ptr %[[VTORDISP_i8]]
// CHECK: ret
}
B::~B() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"??1B@@UAE@XZ"
// Store initial this:
// CHECK: %[[THIS_ADDR:.*]] = alloca ptr
// CHECK: store ptr %{{.*}}, ptr %[[THIS_ADDR]], align 4
// Reload and adjust the this parameter:
// CHECK: %[[THIS_RELOAD:.*]] = load ptr, ptr %[[THIS_ADDR]]
// CHECK: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_RELOAD]], i32 -8
// Restore the vfptr that could have been changed by a subclass.
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 0
// ...
// CHECK: %[[VFPTR_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 %{{.*}}
// CHECK: store ptr @"??_7B@@6B@", ptr %[[VFPTR_i8]]
// Initialize vtorDisp:
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 0
// ...
// CHECK: %[[VBASE_OFFSET:.*]] = add nsw i32 0, %{{.*}}
// CHECK: %[[VTORDISP_VAL:.*]] = sub i32 %[[VBASE_OFFSET]], 8
// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 %[[VBASE_OFFSET]]
// CHECK: %[[VTORDISP_i8:.*]] = getelementptr i8, ptr %[[VBASE_i8]], i32 -4
// CHECK: store i32 %[[VTORDISP_VAL]], ptr %[[VTORDISP_i8]]
foo(); // Avoid the "trivial destructor" optimization.
// CHECK: ret
// CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc void @"??_DB@@QAEXXZ"(ptr
// CHECK2: %[[THIS:.*]] = load ptr, ptr {{.*}}
// CHECK2: %[[B_i8:.*]] = getelementptr i8, ptr %[[THIS]], i32 8
// CHECK2: call x86_thiscallcc void @"??1B@@UAE@XZ"(ptr{{[^,]*}} %[[B_i8]])
// CHECK2: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 8
// CHECK2: call x86_thiscallcc void @"??1VBase@@UAE@XZ"(ptr {{[^,]*}} %[[VBASE_i8]])
// CHECK2: ret
// CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef ptr @"??_GB@@UAEPAXI@Z"
// CHECK2: store ptr %{{.*}}, ptr %[[THIS_ADDR:.*]], align 4
// CHECK2: %[[THIS_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_PARAM_i8:.*]], i32 -8
// CHECK2: call x86_thiscallcc void @"??_DB@@QAEXXZ"(ptr {{[^,]*}} %[[THIS_i8]])
// ...
// CHECK2: ret
}
void B::foo() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"?foo@B@@UAEXXZ"(ptr
//
// B::foo gets 'this' cast to VBase* in ECX (i.e. this+8) so we
// need to adjust 'this' before use.
//
// Coerce this to correct type:
// CHECK: %[[THIS_ADDR:.*]] = alloca ptr
//
// Store initial this:
// CHECK: store ptr {{.*}}, ptr %[[THIS_ADDR]], align 4
//
// Reload and adjust the this parameter:
// CHECK: %[[THIS_RELOAD:.*]] = load ptr, ptr %[[THIS_ADDR]]
// CHECK: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_RELOAD]], i32 -8
field = 42;
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 0
// CHECK: %[[VBTABLE:.*]] = load ptr, ptr %[[VBPTR]]
// CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, ptr %[[VBTABLE]], i32 1
// CHECK: %[[VBOFFSET32:.*]] = load i32, ptr %[[VBENTRY]]
// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 %[[VBOFFSET]]
// CHECK: %[[FIELD:.*]] = getelementptr inbounds nuw %struct.VBase, ptr %[[VBASE_i8]], i32 0, i32 1
// CHECK: store i32 42, ptr %[[FIELD]], align 4
//
// CHECK: ret void
}
void call_vbase_bar(B *obj) {
// CHECK-LABEL: define dso_local void @"?call_vbase_bar@@YAXPAUB@@@Z"(ptr noundef %obj)
// CHECK: %[[OBJ:.*]] = load ptr
obj->bar();
// When calling a vbase's virtual method, one needs to adjust 'this'
// at the caller site.
//
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 0
// CHECK: %[[VBTABLE:.*]] = load ptr, ptr %[[VBPTR]]
// CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, ptr %[[VBTABLE]], i32 1
// CHECK: %[[VBOFFSET32:.*]] = load i32, ptr %[[VBENTRY]]
// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
// CHECK: %[[VBASE:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 %[[VBOFFSET]]
//
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 0
// CHECK: %[[VBTABLE:.*]] = load ptr, ptr %[[VBPTR]]
// CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, ptr %[[VBTABLE]], i32 1
// CHECK: %[[VBOFFSET32:.*]] = load i32, ptr %[[VBENTRY]]
// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 %[[VBOFFSET]]
// CHECK: %[[VFTABLE:.*]] = load ptr, ptr %[[VBASE_i8]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds ptr, ptr %[[VFTABLE]], i64 2
// CHECK: %[[VFUN_VALUE:.*]] = load ptr, ptr %[[VFUN]]
//
// CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](ptr noundef %[[VBASE]])
//
// CHECK: ret void
}
void delete_B(B *obj) {
// CHECK-LABEL: define dso_local void @"?delete_B@@YAXPAUB@@@Z"(ptr noundef %obj)
// CHECK: %[[OBJ:.*]] = load ptr
delete obj;
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 0
// CHECK: %[[VBTABLE:.*]] = load ptr, ptr %[[VBPTR]]
// CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, ptr %[[VBTABLE]], i32 1
// CHECK: %[[VBOFFSET32:.*]] = load i32, ptr %[[VBENTRY]]
// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
// CHECK: %[[VBASE:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 %[[VBOFFSET]]
//
// CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 0
// CHECK: %[[VBTABLE:.*]] = load ptr, ptr %[[VBPTR]]
// CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, ptr %[[VBTABLE]], i32 1
// CHECK: %[[VBOFFSET32:.*]] = load i32, ptr %[[VBENTRY]]
// CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
// CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 %[[VBOFFSET]]
// CHECK: %[[VFTABLE:.*]] = load ptr, ptr %[[VBASE_i8]]
// CHECK: %[[VFUN:.*]] = getelementptr inbounds ptr, ptr %[[VFTABLE]], i64 0
// CHECK: %[[VFUN_VALUE:.*]] = load ptr, ptr %[[VFUN]]
//
// CHECK: call x86_thiscallcc noundef ptr %[[VFUN_VALUE]](ptr {{[^,]*}} %[[VBASE]], i32 noundef 1)
// CHECK: ret void
}
void call_complete_dtor() {
// CHECK-LABEL: define dso_local void @"?call_complete_dtor@@YAXXZ"
B b;
// CHECK: call x86_thiscallcc noundef ptr @"??0B@@QAE@XZ"(ptr {{[^,]*}} %[[B:.*]], i32 noundef 1)
// CHECK-NOT: getelementptr
// CHECK: call x86_thiscallcc void @"??_DB@@QAEXXZ"(ptr {{[^,]*}} %[[B]])
// CHECK: ret
}
struct C : B {
C();
// has an implicit vdtor.
};
// Used to crash on an assertion.
C::C() {
// CHECK-LABEL: define dso_local x86_thiscallcc noundef ptr @"??0C@@QAE@XZ"
}
namespace multiple_vbases {
struct A {
virtual void a();
};
struct B {
virtual void b();
};
struct C {
virtual void c();
};
struct D : virtual A, virtual B, virtual C {
virtual void a();
virtual void b();
virtual void c();
D();
};
D::D() {
// CHECK-LABEL: define dso_local x86_thiscallcc noundef ptr @"??0D@multiple_vbases@@QAE@XZ"
// Just make sure we emit 3 vtordisps after initializing vfptrs.
// CHECK: store ptr @"??_7D@multiple_vbases@@6BA@1@@", ptr %{{.*}}
// CHECK: store ptr @"??_7D@multiple_vbases@@6BB@1@@", ptr %{{.*}}
// CHECK: store ptr @"??_7D@multiple_vbases@@6BC@1@@", ptr %{{.*}}
// ...
// CHECK: store i32 %{{.*}}, ptr %{{.*}}
// CHECK: store i32 %{{.*}}, ptr %{{.*}}
// CHECK: store i32 %{{.*}}, ptr %{{.*}}
// CHECK: ret
}
}
namespace diamond {
struct A {
A();
virtual ~A();
};
struct B : virtual A {
B();
~B();
};
struct C : virtual A {
C();
~C();
int c1, c2, c3;
};
struct Z {
int z;
};
struct D : virtual Z, B, C {
D();
~D();
} d;
D::~D() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"??1D@diamond@@UAE@XZ"(ptr{{.*}})
// Store initial this:
// CHECK: %[[THIS_ADDR:.*]] = alloca ptr
// CHECK: store ptr %{{.*}}, ptr %[[THIS_ADDR]], align 4
//
// Reload and adjust the this parameter:
// CHECK: %[[THIS_RELOAD:.*]] = load ptr, ptr %[[THIS_ADDR]]
// CHECK: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_RELOAD]], i32 -24
//
// CHECK: %[[C_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_ADJ_i8]], i32 4
// CHECK: %[[ARG:.*]] = getelementptr i8, ptr %{{.*}}, i32 16
// CHECK: call x86_thiscallcc void @"??1C@diamond@@UAE@XZ"(ptr{{[^,]*}} %[[ARG]])
// CHECK: %[[ARG:.*]] = getelementptr i8, ptr %[[THIS_ADJ_i8]], i32 4
// CHECK: call x86_thiscallcc void @"??1B@diamond@@UAE@XZ"(ptr{{[^,]*}} %[[ARG]])
// CHECK: ret void
}
}
namespace test2 {
struct A { A(); };
struct B : virtual A { B() {} };
struct C : B, A { C() {} };
// PR18435: Order mattered here. We were generating code for the delegating
// call to B() from C().
void callC() { C x; }
// CHECK-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef ptr @"??0C@test2@@QAE@XZ"
// CHECK: (ptr {{[^,]*}} returned align 4 dereferenceable(8) %this, i32 noundef %is_most_derived)
// CHECK: br i1
// Virtual bases
// CHECK: call x86_thiscallcc noundef ptr @"??0A@test2@@QAE@XZ"(ptr {{[^,]*}} %{{.*}})
// CHECK: br label
// Non-virtual bases
// CHECK: call x86_thiscallcc noundef ptr @"??0B@test2@@QAE@XZ"(ptr {{[^,]*}} %{{.*}}, i32 noundef 0)
// CHECK: call x86_thiscallcc noundef ptr @"??0A@test2@@QAE@XZ"(ptr {{[^,]*}} %{{.*}})
// CHECK: ret
// CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef ptr @"??0B@test2@@QAE@XZ"
// CHECK2: (ptr {{[^,]*}} returned align 4 dereferenceable(4) %this, i32 noundef %is_most_derived)
// CHECK2: call x86_thiscallcc noundef ptr @"??0A@test2@@QAE@XZ"(ptr {{[^,]*}} %{{.*}})
// CHECK2: ret
}
namespace test3 {
// PR19104: A non-virtual call of a virtual method doesn't use vftable thunks,
// so requires only static adjustment which is different to the one used
// for virtual calls.
struct A {
virtual void foo();
};
struct B : virtual A {
virtual void bar();
};
struct C : virtual A {
virtual void foo();
};
struct D : B, C {
virtual void bar();
int field; // Laid out between C and A subobjects in D.
};
void D::bar() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"?bar@D@test3@@UAEXXZ"(ptr {{[^,]*}} %this)
C::foo();
// Shouldn't need any vbtable lookups. All we have to do is adjust to C*,
// then compensate for the adjustment performed in the C::foo() prologue.
// CHECK: %[[C_i8:.*]] = getelementptr inbounds i8, ptr %{{.*}}, i32 8
// CHECK: %[[ARG:.*]] = getelementptr i8, ptr %[[C_i8]], i32 4
// CHECK: call x86_thiscallcc void @"?foo@C@test3@@UAEXXZ"(ptr noundef %[[ARG]])
// CHECK: ret
}
}
namespace test4{
// PR19172: We used to merge method vftable locations wrong.
struct A {
virtual ~A() {}
};
struct B {
virtual ~B() {}
};
struct C : virtual A, B {
virtual ~C();
};
void foo(void*);
C::~C() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"??1C@test4@@UAE@XZ"(ptr {{[^,]*}} %this)
// In this case "this" points to the most derived class, so no GEPs needed.
// CHECK-NOT: getelementptr
// CHECK: store ptr @"??_7C@test4@@6BB@1@@", ptr %{{.*}}
foo(this);
// CHECK: ret
}
void destroy(C *obj) {
// CHECK-LABEL: define dso_local void @"?destroy@test4@@YAXPAUC@1@@Z"(ptr noundef %obj)
delete obj;
// CHECK: %[[OBJ:.*]] = load ptr, ptr
// CHECK: %[[VFTABLE:.*]] = load ptr, ptr %[[OBJ]]
// CHECK: %[[VFTENTRY:.*]] = getelementptr inbounds ptr, ptr %[[VFTABLE]], i64 0
// CHECK: %[[VFUN:.*]] = load ptr, ptr %[[VFTENTRY]]
// CHECK: call x86_thiscallcc noundef ptr %[[VFUN]](ptr {{[^,]*}} %[[OBJ]], i32 noundef 1)
// CHECK: ret
}
struct D {
virtual void d();
};
// The first non-virtual base doesn't have a vdtor,
// but "this adjustment" is not needed.
struct E : D, B, virtual A {
virtual ~E();
};
E::~E() {
// CHECK-LABEL: define dso_local x86_thiscallcc void @"??1E@test4@@UAE@XZ"(ptr{{[^,]*}} %this)
// In this case "this" points to the most derived class, so no GEPs needed.
// CHECK-NOT: getelementptr
// CHECK: store ptr @"??_7E@test4@@6BD@1@@", ptr %{{.*}}
foo(this);
}
void destroy(E *obj) {
// CHECK-LABEL: define dso_local void @"?destroy@test4@@YAXPAUE@1@@Z"(ptr noundef %obj)
// CHECK-NOT: getelementptr
// CHECK: %[[THIS_i8:.*]] = getelementptr inbounds i8, ptr %[[OBJ]], i32 4
// CHECK: %[[B_i8:.*]] = getelementptr inbounds i8, ptr %[[OBJ:.*]], i32 4
// CHECK: %[[VFTABLE:.*]] = load ptr, ptr %[[B_i8]]
// CHECK: %[[VFTENTRY:.*]] = getelementptr inbounds ptr, ptr %[[VFTABLE]], i64 0
// CHECK: %[[VFUN:.*]] = load ptr, ptr %[[VFTENTRY]]
// CHECK: call x86_thiscallcc noundef ptr %[[VFUN]](ptr{{[^,]*}} %[[THIS_i8]], i32 noundef 1)
delete obj;
}
}
namespace test5 {
// PR25370: Don't zero-initialize vbptrs in virtual bases.
struct A {
virtual void f();
};
struct B : virtual A {
int Field;
};
struct C : B {
C();
};
C::C() : B() {}
// CHECK-LABEL: define dso_local x86_thiscallcc noundef ptr @"??0C@test5@@QAE@XZ"(
// CHECK: %[[THIS:.*]] = load ptr, ptr
// CHECK: br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
// CHECK: %[[SKIP_VBASES]]
// CHECK: %[[FIELD:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 4
// CHECK: call void @llvm.memset.p0.i32(ptr align 4 %[[FIELD]], i8 0, i32 4, i1 false)
}
namespace pr27621 {
// Devirtualization through a static_cast used to make us compute the 'this'
// adjustment for B::g instead of C::g. When we directly call C::g, 'this' is a
// B*, and the prologue of C::g will adjust it to a C*.
struct A { virtual void f(); };
struct B { virtual void g(); };
struct C final : A, B {
virtual void h();
void g() override;
};
void callit(C *p) {
static_cast<B*>(p)->g();
}
// CHECK-LABEL: define dso_local void @"?callit@pr27621@@YAXPAUC@1@@Z"(ptr noundef %{{.*}})
// CHECK: %[[B_i8:.*]] = getelementptr i8, ptr %{{.*}}, i32 4
// CHECK: call x86_thiscallcc void @"?g@C@pr27621@@UAEXXZ"(ptr noundef %[[B_i8]])
}
namespace test6 {
class A {};
class B : virtual A {};
class C : virtual B {
virtual void m_fn1();
float field;
};
class D : C {
D();
};
D::D() : C() {}
// CHECK-LABEL: define dso_local x86_thiscallcc noundef ptr @"??0D@test6@@AAE@XZ"(
// CHECK: %[[THIS:.*]] = load ptr, ptr
// CHECK: br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
// CHECK: %[[SKIP_VBASES]]
// CHECK: %[[FIELD:.*]] = getelementptr inbounds i8, ptr %[[THIS]], i32 8
// CHECK: call void @llvm.memset.p0.i32(ptr align 4 %[[FIELD]], i8 0, i32 4, i1 false)
}
namespace pr36921 {
struct A {
virtual ~A() {}
};
struct B {
virtual ~B() {}
};
struct C : virtual B {};
struct D : virtual A, C {};
D d;
// CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef ptr @"??_GD@pr36921@@UAEPAXI@Z"(
// CHECK2: %[[THIS_RELOAD:.*]] = load ptr, ptr
// CHECK2: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, ptr %[[THIS_RELOAD]], i32 -4
}
namespace issue_60465 {
// We used to assume the first argument to all destructors was the derived type
// even when there was a 'this' adjustment.
struct A {
virtual ~A();
};
struct alignas(2 * sizeof(void *)) B : virtual A {
~B();
void *x, *y;
};
B::~B() {
// The 'this' parameter should not have a type of ptr and
// must not have 'align 8', since at least B's copy of A is only 'align 4'.
// CHECK-LABEL: define dso_local x86_thiscallcc void @"??1B@issue_60465@@UAE@XZ"(ptr noundef %this)
// CHECK: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, ptr %{{.*}}, i32 -12
// CHECK: %[[X:.*]] = getelementptr inbounds nuw %"struct.issue_60465::B", ptr %[[THIS_ADJ_i8]], i32 0, i32 1
// CHECK: store ptr null, ptr %[[X]], align 4
// CHECK: %[[Y:.*]] = getelementptr inbounds nuw %"struct.issue_60465::B", ptr %[[THIS_ADJ_i8]], i32 0, i32 2
// CHECK: store ptr null, ptr %[[Y]], align 8
x = nullptr;
y = nullptr;
}
}
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