clang/test/CodeGenCXX/virtual-bases.cpp

   1 // RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-apple-darwin10 -mconstructor-aliases | FileCheck %s
   2
   3 struct A {
   4   A();
   5 };
   6
   7 // CHECK: @_ZN1AC1Ev ={{.*}} unnamed_addr alias {{.*}} @_ZN1AC2Ev
   8 // CHECK-LABEL: define{{.*}} void @_ZN1AC2Ev(ptr {{[^,]*}} %this) unnamed_addr
   9 A::A() { }
  10
  11 struct B : virtual A {
  12   B();
  13 };
  14
  15 // CHECK-LABEL: define{{.*}} void @_ZN1BC2Ev(ptr {{[^,]*}} %this, ptr noundef %vtt) unnamed_addr
  16 // CHECK-LABEL: define{{.*}} void @_ZN1BC1Ev(ptr {{[^,]*}} %this) unnamed_addr
  17 B::B() { }
  18
  19 struct C : virtual A {
  20   C(bool);
  21 };
  22
  23 // CHECK-LABEL: define{{.*}} void @_ZN1CC2Eb(ptr {{[^,]*}} %this, ptr noundef %vtt, i1 noundef zeroext %0) unnamed_addr
  24 // CHECK-LABEL: define{{.*}} void @_ZN1CC1Eb(ptr {{[^,]*}} %this, i1 noundef zeroext %0) unnamed_addr
  25 C::C(bool) { }
  26
  27 // PR6251
  28 namespace PR6251 {
  29
  30 // Test that we don't call the A<char> constructor twice.
  31
  32 template<typename T>
  33 struct A { A(); };
  34
  35 struct B : virtual A<char> { };
  36 struct C : virtual A<char> { };
  37
  38 struct D : B, C  {
  39   D();
  40 };
  41
  42 // CHECK-LABEL: define{{.*}} void @_ZN6PR62511DC1Ev(ptr {{[^,]*}} %this) unnamed_addr
  43 // CHECK: call void @_ZN6PR62511AIcEC2Ev
  44 // CHECK-NOT: call void @_ZN6PR62511AIcEC2Ev
  45 // CHECK: ret void
  46 D::D() { }
  47
  48 }
  49
  50 namespace virtualBaseAlignment {
  51
  52 // Check that the store to B::x in the base constructor has an 8-byte alignment.
  53
  54 // CHECK: define linkonce_odr void @_ZN20virtualBaseAlignment1BC1Ev(ptr {{[^,]*}} %[[THIS:.*]])
  55 // CHECK: %[[THIS_ADDR:.*]] = alloca ptr, align 8
  56 // CHECK: store ptr %[[THIS]], ptr %[[THIS_ADDR]], align 8
  57 // CHECK: %[[THIS1:.*]] = load ptr, ptr %[[THIS_ADDR]], align 8
  58 // CHECK: %[[X:.*]] = getelementptr inbounds nuw %[[STRUCT_B:.*]], ptr %[[THIS1]], i32 0, i32 2
  59 // CHECK: store i32 123, ptr %[[X]], align 16
  60
  61 // CHECK: define linkonce_odr void @_ZN20virtualBaseAlignment1BC2Ev(ptr {{[^,]*}} %[[THIS:.*]], ptr noundef %{{.*}})
  62 // CHECK: %[[THIS_ADDR:.*]] = alloca ptr, align 8
  63 // CHECK: store ptr %[[THIS]], ptr %[[THIS_ADDR]], align 8
  64 // CHECK: %[[THIS1:.*]] = load ptr, ptr %[[THIS_ADDR]], align 8
  65 // CHECK: %[[X:.*]] = getelementptr inbounds nuw %[[STRUCT_B]], ptr %[[THIS1]], i32 0, i32 2
  66 // CHECK: store i32 123, ptr %[[X]], align 8
  67
  68 struct A {
  69   __attribute__((aligned(16))) double data1;
  70 };
  71
  72 struct B : public virtual A {
  73   B() : x(123) {}
  74   double a;
  75   int x;
  76 };
  77
  78 struct C : public virtual B {};
  79
  80 void test() { B b; C c; }
  81
  82 }