clang/test/CodeGenCXX/attribute_internal_linkage.cpp

   1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -std=c++11 -emit-llvm -o - %s | FileCheck %s
   2
   3 __attribute__((internal_linkage)) void f() {}
   4 // CHECK-DAG: define internal void @_ZL1fv
   5
   6 class A {
   7 public:
   8   static int y __attribute__((internal_linkage));
   9   static int y2 [[clang::internal_linkage]];
  10 // CHECK-DAG: @_ZN1A1yE = internal global
  11 // CHECK-DAG: @_ZN1A2y2E = internal global
  12   void f1() __attribute__((internal_linkage));
  13 // CHECK-DAG: define internal void @_ZN1A2f1Ev
  14   void f2() __attribute__((internal_linkage)) {}
  15 // CHECK-DAG: define internal void @_ZN1A2f2Ev
  16   static void f4() __attribute__((internal_linkage)) {}
  17 // CHECK-DAG: define internal void @_ZN1A2f4Ev
  18   A() __attribute__((internal_linkage)) {}
  19 // CHECK-DAG: define internal void @_ZN1AC1Ev
  20 // CHECK-DAG: define internal void @_ZN1AC2Ev
  21   ~A() __attribute__((internal_linkage)) {}
  22 // CHECK-DAG: define internal void @_ZN1AD1Ev
  23 // CHECK-DAG: define internal void @_ZN1AD2Ev
  24 };
  25
  26 int A::y;
  27 int A::y2;
  28
  29 void A::f1() {
  30 }
  31
  32 // Forward declaration w/o an attribute.
  33 class B;
  34
  35 // Internal_linkage on a class affects all its members.
  36 class __attribute__((internal_linkage)) B {
  37 public:
  38   B() {}
  39   // CHECK-DAG: define internal void @_ZNL1BC1Ev
  40   // CHECK-DAG: define internal void @_ZNL1BC2Ev
  41   ~B() {}
  42   // CHECK-DAG: define internal void @_ZNL1BD1Ev
  43   // CHECK-DAG: define internal void @_ZNL1BD2Ev
  44   void f() {};
  45   // CHECK-DAG: define internal void @_ZNL1B1fEv
  46   static int x;
  47   // CHECK-DAG: @_ZNL1B1xE = internal global
  48 };
  49
  50 int B::x;
  51
  52 // Forward declaration with the attribute.
  53 class __attribute__((internal_linkage)) C;
  54 class C {
  55 public:
  56   static int x;
  57   // CHECK-DAG: @_ZNL1C1xE = internal global
  58 };
  59
  60 int C::x;
  61
  62 __attribute__((internal_linkage)) void g();
  63 void g() {}
  64 // CHECK-DAG: define internal void @_ZL1gv()
  65
  66 void use() {
  67   A a;
  68   a.f1();
  69   a.f2();
  70   A::f4();
  71   f();
  72   int &Y = A::y;
  73   int &Y2 = A::y2;
  74   B b;
  75   b.f();
  76   int &XX2 = B::x;
  77   g();
  78   int &XX3 = C::x;
  79 }