clang/test/CodeGenCXX/cxx1y-initializer-aggregate.cpp

   1 // RUN: %clang_cc1 -std=c++1y %s -triple x86_64-linux-gnu -emit-llvm -o - | FileCheck %s
   2
   3 struct A {
   4   int n = 0;
   5   const char *p;
   6   char k = p[n];
   7   int f();
   8   int x = f();
   9   union {
  10     char c;
  11     double d = 1.0;
  12   };
  13 };
  14
  15 int f();
  16
  17 union B {
  18   int a;
  19   int f();
  20   int b = f();
  21 };
  22
  23 A a { .p = "foobar" };
  24 A b { 4, "bazquux", .x = 42, .c = 9 };
  25 A c { 1, 0, 'A', f(), { 3 } };
  26
  27 // CHECK: @[[STR_A:.*]] = {{.*}} [7 x i8] c"foobar\00"
  28 // CHECK: @a ={{.*}} global {{.*}} zeroinitializer
  29
  30 // @b has a constant initializer
  31 // CHECK: @[[STR_B:.*]] = {{.*}} [8 x i8] c"bazquux\00"
  32 // CHECK: @b ={{.*}} global {{.*}} i32 4, {{.*}} @[[STR_B]], i8 117, i32 42, {{.*}} i8 9
  33
  34 B x;
  35 B y {};
  36 B z { 1 };
  37 // CHECK: @z ={{.*}} global {{.*}} { i32 1 }
  38
  39 // Brace initialization should initialize the first field even though it is
  40 // unnamed.
  41 union C {
  42   struct {
  43     int C::*memptr;
  44   };
  45 };
  46
  47 C n{};
  48 // CHECK: @n ={{.*}} global %union.C { %struct.anon { i64 -1 } }, align 8
  49
  50 // Initialization of 'a':
  51
  52 // CHECK: store i32 0, ptr @a
  53 // CHECK: store ptr @[[STR_A]], ptr getelementptr inbounds ({{.*}} @a, i32 0, i32 1)
  54 // CHECK: load ptr, ptr getelementptr inbounds ({{.*}} @a, i32 0, i32 1)
  55 // CHECK: load i32, ptr @a
  56 // CHECK: getelementptr inbounds i8, ptr %{{.*}}, {{.*}} %{{.*}}
  57 // CHECK: store i8 %{{.*}}, ptr getelementptr inbounds ({{.*}} @a, i32 0, i32 2)
  58 // CHECK: call noundef i32 @_ZN1A1fEv({{.*}} @a)
  59 // CHECK: store i32 %{{.*}}, ptr getelementptr inbounds ({{.*}}, ptr @a, i32 0, i32 3)
  60 // CHECK: store double 1.000000e+00, ptr getelementptr inbounds ({{.*}} @a, i32 0, i32 4)
  61
  62 // No dynamic initialization of 'b':
  63
  64 // CHECK-NOT: @b
  65
  66 // Initialization of 'c':
  67
  68 // CHECK: store i32 1, ptr @c
  69 // CHECK: store ptr null, ptr getelementptr inbounds ({{.*}} @c, i32 0, i32 1)
  70 // CHECK-NOT: load
  71 // CHECK: store i8 65, ptr getelementptr inbounds ({{.*}} @c, i32 0, i32 2)
  72 // CHECK: call noundef i32 @_Z1fv()
  73 // CHECK: store i32 %{{.*}}, ptr getelementptr inbounds ({{.*}}, ptr @c, i32 0, i32 3)
  74 // CHECK-NOT: C1Ev
  75 // CHECK: store i8 3, ptr {{.*}} @c, i32 0, i32 4)
  76
  77 // CHECK: call void @_ZN1BC1Ev({{.*}} @x)
  78
  79 // CHECK: call noundef i32 @_ZN1B1fEv({{.*}} @y)
  80 // CHECK: store i32 %{{.*}}, ptr @y