test/CodeGenCXX/derived-to-base-conv.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++0x -S %s -o %t-64.s
   2 // RUN: FileCheck -check-prefix LP64 --input-file=%t-64.s %s
   3 // RUN: %clang_cc1 -triple i386-apple-darwin -std=c++0x -S %s -o %t-32.s
   4 // RUN: FileCheck -check-prefix LP32 --input-file=%t-32.s %s
   5
   6 extern "C" int printf(...);
   7 extern "C" void exit(int);
   8
   9 struct A {
  10   A (const A&) { printf("A::A(const A&)\n"); }
  11   A() {};
  12   ~A() { printf("A::~A()\n"); }
  13 };
  14
  15 struct B : public A {
  16   B() {};
  17   B(const B& Other) : A(Other) { printf("B::B(const B&)\n"); }
  18   ~B() { printf("B::~B()\n"); }
  19 };
  20
  21 struct C : public B {
  22   C() {};
  23   C(const C& Other) : B(Other) { printf("C::C(const C&)\n"); }
  24   ~C() { printf("C::~C()\n"); }
  25 };
  26
  27 struct X {
  28         operator B&() {printf("X::operator B&()\n"); return b; }
  29         operator C&() {printf("X::operator C&()\n"); return c; }
  30         X (const X&) { printf("X::X(const X&)\n"); }
  31         X () { printf("X::X()\n"); }
  32         ~X () { printf("X::~X()\n"); }
  33         B b;
  34         C c;
  35 };
  36
  37 void f(A) {
  38   printf("f(A)\n");
  39 }
  40
  41
  42 void func(X x)
  43 {
  44   f (x);
  45 }
  46
  47 int main()
  48 {
  49     X x;
  50     func(x);
  51 }
  52
  53 struct Base;
  54
  55 struct Root {
  56   operator Base&() { exit(1); }
  57 };
  58
  59 struct Derived;
  60
  61 struct Base : Root {
  62   Base(const Base&) { printf("Base::(const Base&)\n"); }
  63   Base() { printf("Base::Base()\n"); }
  64   operator Derived&() { exit(1); }
  65 };
  66
  67 struct Derived : Base {
  68 };
  69
  70 void foo(Base) {}
  71
  72 void test(Derived bb)
  73 {
  74         // CHECK-LP64-NOT: callq    __ZN4BasecvR7DerivedEv
  75         // CHECK-LP32-NOT: callq    L__ZN4BasecvR7DerivedEv
  76         foo(bb);
  77 }
  78 // CHECK-LP64: callq    __ZN1XcvR1BEv
  79 // CHECK-LP64: callq    __ZN1AC1ERKS_
  80
  81 // CHECK-LP32: calll     L__ZN1XcvR1BEv
  82 // CHECK-LP32: calll     L__ZN1AC1ERKS_
  83
  84