clang/test/CodeGenCXX/pragma-init_seg.cpp

   1 // RUN: %clang_cc1 %s -triple=i686-pc-win32 -fms-extensions -emit-llvm -o - | FileCheck %s
   2
   3 int f();
   4
   5 // CHECK: $"?x@selectany_init@@3HA" = comdat any
   6 // CHECK: $"?x@?$A@H@explicit_template_instantiation@@2HB" = comdat any
   7 // CHECK: $"?x@?$A@H@implicit_template_instantiation@@2HB" = comdat any
   8
   9 namespace simple_init {
  10 #pragma init_seg(compiler)
  11 int x = f();
  12 // CHECK: @"?x@simple_init@@3HA" = dso_local global i32 0, align 4
  13 // CHECK: @__cxx_init_fn_ptr = private constant void ()* @"??__Ex@simple_init@@YAXXZ", section ".CRT$XCC"
  14
  15 #pragma init_seg(lib)
  16 int y = f();
  17 // CHECK: @"?y@simple_init@@3HA" = dso_local global i32 0, align 4
  18 // CHECK: @__cxx_init_fn_ptr.1 = private constant void ()* @"??__Ey@simple_init@@YAXXZ", section ".CRT$XCL"
  19
  20 #pragma init_seg(user)
  21 int z = f();
  22 // CHECK: @"?z@simple_init@@3HA" = dso_local global i32 0, align 4
  23 // No function pointer!  This one goes on @llvm.global_ctors.
  24 }
  25
  26 #pragma init_seg(".asdf")
  27
  28 namespace internal_init {
  29 namespace {
  30 int x = f();
  31 // CHECK: @"?x@?A0x{{[^@]*}}@internal_init@@3HA" = internal global i32 0, align 4
  32 // CHECK: @__cxx_init_fn_ptr.2 = private constant void ()* @"??__Ex@?A0x{{[^@]*}}@internal_init@@YAXXZ", section ".asdf"
  33 }
  34 }
  35
  36 namespace selectany_init {
  37 int __declspec(selectany) x = f();
  38 // CHECK: @"?x@selectany_init@@3HA" = weak_odr dso_local global i32 0, comdat, align 4
  39 // CHECK: @__cxx_init_fn_ptr.3 = private constant void ()* @"??__Ex@selectany_init@@YAXXZ", section ".asdf", comdat($"?x@selectany_init@@3HA")
  40 }
  41
  42 namespace explicit_template_instantiation {
  43 template <typename T> struct A { static const int x; };
  44 template <typename T> const int A<T>::x = f();
  45 template struct A<int>;
  46 // CHECK: @"?x@?$A@H@explicit_template_instantiation@@2HB" = weak_odr dso_local global i32 0, comdat, align 4
  47 // CHECK: @__cxx_init_fn_ptr.4 = private constant void ()* @"??__E?x@?$A@H@explicit_template_instantiation@@2HB@@YAXXZ", section ".asdf", comdat($"?x@?$A@H@explicit_template_instantiation@@2HB")
  48 }
  49
  50 namespace implicit_template_instantiation {
  51 template <typename T> struct A { static const int x; };
  52 template <typename T> const int A<T>::x = f();
  53 int g() { return A<int>::x; }
  54 // CHECK: @"?x@?$A@H@implicit_template_instantiation@@2HB" = linkonce_odr dso_local global i32 0, comdat, align 4
  55 // CHECK: @__cxx_init_fn_ptr.5 = private constant void ()* @"??__E?x@?$A@H@implicit_template_instantiation@@2HB@@YAXXZ", section ".asdf", comdat($"?x@?$A@H@implicit_template_instantiation@@2HB")
  56 }
  57
  58 // ... and here's where we emitted user level ctors.
  59 // CHECK: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }]
  60 // CHECK: [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_pragma_init_seg.cpp, i8* null }]
  61
  62 // We have to mark everything used so we can survive globalopt, even through
  63 // LTO.  There's no way LLVM could really understand if data in the .asdf
  64 // section is really used or dead.
  65 //
  66 // CHECK: @llvm.used = appending global [6 x i8*]
  67 // CHECK: [i8* bitcast (void ()** @__cxx_init_fn_ptr to i8*),
  68 // CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr.1 to i8*),
  69 // CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr.2 to i8*),
  70 // CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr.3 to i8*),
  71 // CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr.4 to i8*),
  72 // CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr.5 to i8*)], section "llvm.metadata"