clang/test/CodeGenCXX/extern-c.cpp

   1 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm %s -o - | FileCheck %s
   2 namespace foo {
   3
   4 // CHECK-NOT: @a = global
   5 extern "C" int a;
   6
   7 // CHECK-NOT: @_ZN3foo1bE = global
   8 extern int b;
   9
  10 // CHECK: @_ZN3foo1cE = {{(dso_local )?}}global
  11 int c = 5;
  12
  13 // CHECK-NOT: @_ZN3foo1dE
  14 extern "C" struct d;
  15
  16 // CHECK-NOT: should_not_appear
  17 extern "C++" int should_not_appear;
  18
  19 // CHECK: @_ZN3foo10extern_cxxE = {{(dso_local )?}}global
  20 extern "C++" int extern_cxx = 0;
  21
  22 }
  23
  24 // CHECK-NOT: @global_a = {{(dso_local )?}}global
  25 extern "C" int global_a;
  26
  27 // CHECK: @global_b = {{(dso_local )?}}global
  28 extern "C" int global_b = 0;
  29
  30 // CHECK-NOT: should_not_appear
  31 extern "C++" int should_not_appear;
  32
  33 // CHECK: @extern_cxx = {{(dso_local )?}}global
  34 extern "C++" int extern_cxx = 0;
  35
  36 namespace test1 {
  37   namespace {
  38     struct X {};
  39   }
  40   extern "C" {
  41     // CHECK: @test1_b = {{(dso_local )?}}global
  42     X test1_b = X();
  43   }
  44   void *use = &test1_b;
  45   // CHECK: @_ZN5test13useE = {{(dso_local )?}}global
  46 }
  47
  48 namespace test2 {
  49   namespace {
  50     struct X {};
  51   }
  52
  53   // CHECK: @test2_b = {{(dso_local )?}}global
  54   extern "C" X test2_b;
  55   X test2_b;
  56 }
  57
  58 extern "C" {
  59   static int unused_var;
  60   static int unused_fn() { return 0; }
  61
  62   __attribute__((used)) static int internal_var;
  63   __attribute__((used)) static int internal_fn() { return 0; }
  64
  65   __attribute__((used)) static int duplicate_internal_var;
  66   __attribute__((used)) static int duplicate_internal_fn() { return 0; }
  67
  68   namespace N {
  69     __attribute__((used)) static int duplicate_internal_var;
  70     __attribute__((used)) static int duplicate_internal_fn() { return 0; }
  71   }
  72
  73   // CHECK: @llvm.compiler.used = appending global {{.*}} @internal_var, {{.*}} @internal_fn
  74
  75   // CHECK-NOT: @unused
  76   // CHECK-NOT: @duplicate_internal
  77   // CHECK: @internal_var = internal alias i32, ptr @_ZL12internal_var
  78   // CHECK-NOT: @unused
  79   // CHECK-NOT: @duplicate_internal
  80   // CHECK: @internal_fn = internal alias i32 (), ptr @_ZL11internal_fnv
  81   // CHECK-NOT: @unused
  82   // CHECK-NOT: @duplicate_internal
  83 }
  84
  85 namespace PR19411 {
  86   struct A { void f(); };
  87   extern "C" void A::f() { void g(); g(); }
  88   // CHECK-LABEL: @_ZN7PR194111A1fEv(
  89   // CHECK: call {{.*}}void @g()
  90 }