1 // Diamond virtual inheritance. 2 // This should cover virtual inheritance, construction vtables, and VTTs. 3 4 // RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O1 -S -o - -emit-llvm -fhalf-no-semantic-interposition | FileCheck %s 5 6 // Class A contains a vtable ptr, then int, then padding 7 // CHECK-DAG: %class.B = type { i32 (...)**, %class.A.base } 8 // CHECK-DAG: %class.A.base = type <{ i32 (...)**, i32 }> 9 // CHECK-DAG: %class.A = type <{ i32 (...)**, i32, [4 x i8] }> 10 // CHECK-DAG: %class.C = type { i32 (...)**, %class.A.base } 11 // CHECK-DAG: %class.D = type { %class.B.base, %class.C.base, %class.A.base } 12 // CHECK-DAG: %class.B.base = type { i32 (...)** } 13 // CHECK-DAG: %class.C.base = type { i32 (...)** } 14 15 // VTable for B. Contains an extra field at the start for the virtual-base offset. 16 // CHECK: @_ZTV1B.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4 17 18 // VTT for B 19 // CHECK: @_ZTT1B ={{.*}} unnamed_addr constant [2 x i8*] [i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, inrange i32 0, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local, i32 0, inrange i32 1, i32 3) to i8*)], align 8 20 21 // VTable for C 22 // CHECK: @_ZTV1C.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.C*)* dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4 23 24 // VTT for C 25 // CHECK: @_ZTT1C ={{.*}} unnamed_addr constant [2 x i8*] [i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, inrange i32 0, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local, i32 0, inrange i32 1, i32 3) to i8*)], align 8 26 27 // VTable for D 28 // CHECK: @_ZTV1D.local = private unnamed_addr constant { [5 x i32], [4 x i32], [4 x i32] } { [5 x i32] [i32 16, i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64, i8*, i64 }** @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.D*)* dso_local_equivalent @_ZN1D3bazEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 8, i32 -8, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64, i8*, i64 }** @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.C*)* dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 1, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -16, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64, i8*, i64 }** @_ZTI1D.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 2, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, i32 2, i32 3) to i64)) to i32)] }, align 4 29 30 // VTT for D 31 // CHECK: @_ZTT1D ={{.*}} unnamed_addr constant [7 x i8*] [i8* bitcast (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, inrange i32 0, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, inrange i32 0, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, inrange i32 1, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, inrange i32 0, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, inrange i32 1, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, inrange i32 2, i32 3) to i8*), i8* bitcast (i32* getelementptr inbounds ({ [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local, i32 0, inrange i32 1, i32 3) to i8*)], align 8 32 33 // Construction vtable for B-in-D 34 // CHECK: @_ZTC1D0_1B.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 16, i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.B*)* dso_local_equivalent @_ZN1B4barBEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -16, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1B.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4 35 36 // Construction vtable for C-in-D 37 // CHECK: @_ZTC1D8_1C.local = private unnamed_addr constant { [4 x i32], [4 x i32] } { [4 x i32] [i32 8, i32 0, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, i32 0, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.C*)* dso_local_equivalent @_ZN1C4barCEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, i32 0, i32 3) to i64)) to i32)], [4 x i32] [i32 0, i32 -8, i32 trunc (i64 sub (i64 ptrtoint ({ i8*, i8*, i32, i32, i8*, i64 }** @_ZTI1C.rtti_proxy to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, i32 1, i32 3) to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (void (%class.A*)* dso_local_equivalent @_ZN1A3fooEv to i64), i64 ptrtoint (i32* getelementptr inbounds ({ [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local, i32 0, i32 1, i32 3) to i64)) to i32)] }, align 4 38 39 // CHECK: @_ZTV1B ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1B.local 40 // CHECK: @_ZTV1C ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTV1C.local 41 // CHECK: @_ZTC1D0_1B ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D0_1B.local 42 // CHECK: @_ZTC1D8_1C ={{.*}} unnamed_addr alias { [4 x i32], [4 x i32] }, { [4 x i32], [4 x i32] }* @_ZTC1D8_1C.local 43 // CHECK: @_ZTV1D ={{.*}} unnamed_addr alias { [5 x i32], [4 x i32], [4 x i32] }, { [5 x i32], [4 x i32], [4 x i32] }* @_ZTV1D.local 44 45 // CHECK: define{{.*}} void @_Z5D_fooP1D(%class.D* noundef %d) local_unnamed_addr 46 // CHECK-NEXT: entry: 47 // CHECK-NEXT: [[d:%[0-9]+]] = bitcast %class.D* %d to i8** 48 // CHECK-NEXT: [[vtable:%[a-z0-9]+]] = load i8*, i8** [[d]], align 8 49 50 // This normally would've been -24 (8 bytes for the virtual call/base offset, 8 51 // bytes for the offset to top, and 8 bytes for the RTTI pointer), but since all 52 // components in the vtable are halved to 4 bytes, the offset is halved to -12. 53 // CHECK-NEXT: [[vbase_offset_ptr:%[a-z0-9.]+]] = getelementptr i8, i8* [[vtable]], i64 -12 54 55 // CHECK-NEXT: [[vbase_offset_ptr2:%[a-z0-9.]+]] = bitcast i8* [[vbase_offset_ptr]] to i32* 56 // CHECK-NEXT: [[vbase_offset:%[a-z0-9.]+]] = load i32, i32* [[vbase_offset_ptr2]], align 4 57 // CHECK-NEXT: [[d:%[0-9]+]] = bitcast %class.D* %d to i8* 58 // CHECK-NEXT: [[vbase_offset2:%.+]] = sext i32 [[vbase_offset]] to i64 59 // CHECK-NEXT: [[add_ptr:%[a-z0-9.]+]] = getelementptr inbounds i8, i8* [[d]], i64 [[vbase_offset2]] 60 // CHECK-NEXT: [[a:%[0-9]+]] = bitcast i8* [[add_ptr]] to %class.A* 61 // CHECK-NEXT: [[a_i8_ptr:%[0-9]+]] = bitcast i8* [[add_ptr]] to i8** 62 // CHECK-NEXT: [[vtable:%[a-z0-9]+]] = load i8*, i8** [[a_i8_ptr]], align 8 63 // CHECK-NEXT: [[ptr:%[0-9]+]] = call i8* @llvm.load.relative.i32(i8* [[vtable]], i32 0) 64 // CHECK-NEXT: [[method:%[0-9]+]] = bitcast i8* [[ptr]] to void (%class.A*)* 65 // CHECK-NEXT: call void [[method]](%class.A* {{[^,]*}} [[a]]) 66 // CHECK-NEXT: ret void 67 // CHECK-NEXT: } 68 69 class A { 70 public: 71 virtual void foo(); 72 int a; 73 }; 74 75 class B : public virtual A { 76 public: 77 virtual void barB(); 78 }; 79 80 class C : public virtual A { 81 virtual void barC(); 82 }; 83 84 class D : public B, C { 85 public: 86 virtual void baz(); 87 }; 88 89 void B::barB() {} 90 void C::barC() {} 91 void D::baz() {} 92 93 void D_foo(D *d) { 94 d->foo(); 95 } 96