llvm-project/clang/test/CodeGenCXX/attr-loader-uninitialized.cpp

// UNSUPPORTED: system-windows
// RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s

// CHECK: @defn = global i32 undef
int defn  [[clang::loader_uninitialized]];

// CHECK: @_ZL11defn_static = internal global i32 undef
static int defn_static [[clang::loader_uninitialized]] __attribute__((used));

// CHECK: @_ZZ4funcvE4data = internal global i32 undef
int* func(void)
{
  static int data [[clang::loader_uninitialized]];
  return &data;
}

class trivial
{
  float x;
};

// CHECK: @ut = global %class.trivial undef
trivial ut [[clang::loader_uninitialized]];

// CHECK: @arr = global [32 x double] undef
double arr[32] __attribute__((loader_uninitialized));

// Defining as arr2[] [[clang..]] raises the error: attribute cannot be applied to types
// CHECK: @arr2 = global [4 x double] undef
double arr2 [[clang::loader_uninitialized]] [4];

template<typename T> struct templ{T * t;};

// CHECK: @templ_int = global %struct.templ undef, align 8
templ<int> templ_int [[clang::loader_uninitialized]];

// CHECK: @templ_trivial = global %struct.templ.0 undef, align 8
templ<trivial> templ_trivial [[clang::loader_uninitialized]];

// CHECK: @templ_incomplete = global %struct.templ.1 undef, align 8
struct incomplete;
templ<incomplete> templ_incomplete [[clang::loader_uninitialized]];