clang/test/CodeGenCXX/const-init-cxx11.cpp

   1 // RUN: %clang_cc1 -w -fmerge-all-constants -triple x86_64-elf-gnu -emit-llvm -o - %s -std=c++11 | FileCheck %s
   2
   3 // FIXME: The padding in all these objects should be zero-initialized.
   4 namespace StructUnion {
   5   struct A {
   6     int n;
   7     double d;
   8     union U {
   9       constexpr U(int x) : x(x) {}
  10       constexpr U(const char *y) : y(y) {}
  11       int x;
  12       const char *y;
  13     } u;
  14
  15     constexpr A(int n, double d, int x) : n(n), d(d), u(x) {}
  16     constexpr A(int n, double d, const char *y) : n(n), d(d), u(y) {}
  17   };
  18
  19   // CHECK: @_ZN11StructUnion1aE ={{.*}} constant {{.*}} { i32 1, double 2.000000e+00, {{.*}} { i32 3, [4 x i8] undef } }
  20   extern constexpr A a(1, 2.0, 3);
  21
  22   // CHECK: @_ZN11StructUnion1bE ={{.*}} constant {{.*}} { i32 4, double 5.000000e+00, {{.*}} { i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0) } }
  23   extern constexpr A b(4, 5, "hello");
  24
  25   struct B {
  26     int n;
  27   };
  28
  29   // CHECK: @_ZN11StructUnion1cE ={{.*}} global {{.*}} zeroinitializer
  30   // CHECK: @_ZN11StructUnion2c2E ={{.*}} global {{.*}} zeroinitializer
  31   B c;
  32   B c2 = B();
  33
  34   // CHECK: @_ZN11StructUnion1dE ={{.*}} global {{.*}} zeroinitializer
  35   B d[10];
  36
  37   struct C {
  38     constexpr C() : c(0) {}
  39     int c;
  40   };
  41
  42   // CHECK: @_ZN11StructUnion1eE ={{.*}} global {{.*}} zeroinitializer
  43   C e[10];
  44
  45   struct D {
  46     constexpr D() : d(5) {}
  47     int d;
  48   };
  49
  50   // CHECK: @_ZN11StructUnion1fE ={{.*}} global {{.*}} { i32 5 }
  51   D f;
  52
  53   union E {
  54     int a;
  55     void *b = &f;
  56   };
  57
  58   // CHECK: @_ZN11StructUnion1gE ={{.*}} global {{.*}} @_ZN11StructUnion1fE
  59   E g;
  60
  61   // CHECK: @_ZN11StructUnion1hE ={{.*}} global {{.*}} @_ZN11StructUnion1fE
  62   E h = E();
  63 }
  64
  65 namespace BaseClass {
  66   template<typename T, unsigned> struct X : T {};
  67   struct C { char c = 1; };
  68   template<unsigned... Ns> struct Cs : X<C,Ns>... {};
  69   struct N { int n = 3; };
  70   struct D { double d = 4.0; };
  71
  72   template<typename ...Ts>
  73   struct Test : Ts... { constexpr Test() : Ts()..., n(5) {} int n; };
  74
  75   using Test1 = Test<N, C, Cs<1,2>, D, X<C,1>>;
  76   // CHECK: @_ZN9BaseClass2t1E ={{.*}} constant {{.*}} { i32 3, i8 1, i8 1, i8 1, double 4.000000e+00, i8 1, i32 5 }, align 8
  77   extern constexpr Test1 t1 = Test1();
  78
  79   struct DN : D, N {};
  80   struct DND : DN, X<D,0> {};
  81   struct DNN : DN, X<N,0> {};
  82   // CHECK: @_ZN9BaseClass3dndE ={{.*}} constant {{.*}} { double 4.000000e+00, i32 3, double 4.000000e+00 }
  83   extern constexpr DND dnd = DND();
  84   // Note, N subobject is laid out in DN subobject's tail padding.
  85   // CHECK: @_ZN9BaseClass3dnnE ={{.*}} constant {{.*}} { double 4.000000e+00, i32 3, i32 3 }
  86   extern constexpr DNN dnn = DNN();
  87
  88   struct E {};
  89   struct Test2 : X<E,0>, X<E,1>, X<E,2>, X<E,3> {};
  90   // CHECK: @_ZN9BaseClass2t2E ={{.*}} constant {{.*}} undef
  91   extern constexpr Test2 t2 = Test2();
  92
  93   struct __attribute((packed)) PackedD { double y = 2; };
  94   struct Test3 : C, PackedD { constexpr Test3() {} };
  95   // CHECK: @_ZN9BaseClass2t3E ={{.*}} constant <{ i8, double }> <{ i8 1, double 2.000000e+00 }>
  96   extern constexpr Test3 t3 = Test3();
  97 }
  98
  99 namespace Array {
 100   // CHECK: @_ZN5Array3arrE ={{.*}} constant [2 x i32] [i32 4, i32 0]
 101   extern constexpr int arr[2] = { 4 };
 102
 103   // CHECK: @_ZN5Array1cE ={{.*}} constant [6 x [4 x i8]] [{{.*}} c"foo\00", [4 x i8] c"a\00\00\00", [4 x i8] c"bar\00", [4 x i8] c"xyz\00", [4 x i8] c"b\00\00\00", [4 x i8] c"123\00"]
 104   extern constexpr char c[6][4] = { "foo", "a", { "bar" }, { 'x', 'y', 'z' }, { "b" }, '1', '2', '3' };
 105
 106   // CHECK: @_ZN5Array2ucE ={{.*}} constant [4 x i8] c"foo\00"
 107   extern constexpr unsigned char uc[] = { "foo" };
 108
 109   struct C { constexpr C() : n(5) {} int n, m = 3 * n + 1; };
 110   // CHECK: @_ZN5Array5ctorsE ={{.*}} constant [3 x {{.*}}] [{{.*}} { i32 5, i32 16 }, {{.*}} { i32 5, i32 16 }, {{.*}} { i32 5, i32 16 }]
 111   extern const C ctors[3];
 112   constexpr C ctors[3];
 113
 114   // CHECK: @_ZN5Array1dE ={{.*}} constant {{.*}} { [2 x i32] [i32 1, i32 2], [3 x i32] [i32 3, i32 4, i32 5] }
 115   struct D { int n[2]; int m[3]; } extern constexpr d = { 1, 2, 3, 4, 5 };
 116
 117   struct E {
 118     char c[4];
 119     char d[4];
 120     constexpr E() : c("foo"), d("x") {}
 121   };
 122   // CHECK: @_ZN5Array1eE ={{.*}} constant {{.*}} { [4 x i8] c"foo\00", [4 x i8] c"x\00\00\00" }
 123   extern constexpr E e = E();
 124
 125   // PR13290
 126   struct F { constexpr F() : n(4) {} int n; };
 127   // CHECK: @_ZN5Array2f1E ={{.*}} global {{.*}} zeroinitializer
 128   F f1[1][1][0] = { };
 129   // CHECK: @_ZN5Array2f2E ={{.*}} global {{.* i32 4 .* i32 4 .* i32 4 .* i32 4 .* i32 4 .* i32 4 .* i32 4 .* i32 4}}
 130   F f2[2][2][2] = { };
 131 }
 132
 133 namespace MemberPtr {
 134   struct B1 {
 135     int a, b;
 136     virtual void f();
 137     void g();
 138   };
 139   struct B2 {
 140     int c, d;
 141     virtual void h();
 142     void i();
 143   };
 144   struct C : B1 {
 145     int e;
 146     virtual void j();
 147     void k();
 148   };
 149   struct D : C, B2 {
 150     int z;
 151     virtual void l();
 152     void m();
 153   };
 154
 155   // CHECK: @_ZN9MemberPtr2daE ={{.*}} constant i64 8
 156   // CHECK: @_ZN9MemberPtr2dbE ={{.*}} constant i64 12
 157   // CHECK: @_ZN9MemberPtr2dcE ={{.*}} constant i64 32
 158   // CHECK: @_ZN9MemberPtr2ddE ={{.*}} constant i64 36
 159   // CHECK: @_ZN9MemberPtr2deE ={{.*}} constant i64 16
 160   // CHECK: @_ZN9MemberPtr2dzE ={{.*}} constant i64 40
 161   extern constexpr int (D::*da) = &B1::a;
 162   extern constexpr int (D::*db) = &C::b;
 163   extern constexpr int (D::*dc) = &B2::c;
 164   extern constexpr int (D::*dd) = &D::d;
 165   extern constexpr int (D::*de) = &C::e;
 166   extern constexpr int (D::*dz) = &D::z;
 167
 168   // CHECK: @_ZN9MemberPtr2baE ={{.*}} constant i64 8
 169   // CHECK: @_ZN9MemberPtr2bbE ={{.*}} constant i64 12
 170   // CHECK: @_ZN9MemberPtr2bcE ={{.*}} constant i64 8
 171   // CHECK: @_ZN9MemberPtr2bdE ={{.*}} constant i64 12
 172   // CHECK: @_ZN9MemberPtr2beE ={{.*}} constant i64 16
 173   // CHECK: @_ZN9MemberPtr3b1zE ={{.*}} constant i64 40
 174   // CHECK: @_ZN9MemberPtr3b2zE ={{.*}} constant i64 16
 175   extern constexpr int (B1::*ba) = (int(B1::*))&B1::a;
 176   extern constexpr int (B1::*bb) = (int(B1::*))&C::b;
 177   extern constexpr int (B2::*bc) = (int(B2::*))&B2::c;
 178   extern constexpr int (B2::*bd) = (int(B2::*))&D::d;
 179   extern constexpr int (B1::*be) = (int(B1::*))&C::e;
 180   extern constexpr int (B1::*b1z) = (int(B1::*))&D::z;
 181   extern constexpr int (B2::*b2z) = (int(B2::*))&D::z;
 182
 183   // CHECK: @_ZN9MemberPtr2dfE ={{.*}} constant {{.*}} { i64 1, i64 0 }
 184   // CHECK: @_ZN9MemberPtr2dgE ={{.*}} constant {{.*}} { i64 {{.*}}2B11gEv{{.*}}, i64 0 }
 185   // CHECK: @_ZN9MemberPtr2dhE ={{.*}} constant {{.*}} { i64 1, i64 24 }
 186   // CHECK: @_ZN9MemberPtr2diE ={{.*}} constant {{.*}} { i64 {{.*}}2B21iEv{{.*}}, i64 24 }
 187   // CHECK: @_ZN9MemberPtr2djE ={{.*}} constant {{.*}} { i64 9, i64 0 }
 188   // CHECK: @_ZN9MemberPtr2dkE ={{.*}} constant {{.*}} { i64 {{.*}}1C1kEv{{.*}}, i64 0 }
 189   // CHECK: @_ZN9MemberPtr2dlE ={{.*}} constant {{.*}} { i64 17, i64 0 }
 190   // CHECK: @_ZN9MemberPtr2dmE ={{.*}} constant {{.*}} { i64 {{.*}}1D1mEv{{.*}}, i64 0 }
 191   extern constexpr void (D::*df)() = &C::f;
 192   extern constexpr void (D::*dg)() = &B1::g;
 193   extern constexpr void (D::*dh)() = &B2::h;
 194   extern constexpr void (D::*di)() = &D::i;
 195   extern constexpr void (D::*dj)() = &C::j;
 196   extern constexpr void (D::*dk)() = &C::k;
 197   extern constexpr void (D::*dl)() = &D::l;
 198   extern constexpr void (D::*dm)() = &D::m;
 199
 200   // CHECK: @_ZN9MemberPtr2bfE ={{.*}} constant {{.*}} { i64 1, i64 0 }
 201   // CHECK: @_ZN9MemberPtr2bgE ={{.*}} constant {{.*}} { i64 {{.*}}2B11gEv{{.*}}, i64 0 }
 202   // CHECK: @_ZN9MemberPtr2bhE ={{.*}} constant {{.*}} { i64 1, i64 0 }
 203   // CHECK: @_ZN9MemberPtr2biE ={{.*}} constant {{.*}} { i64 {{.*}}2B21iEv{{.*}}, i64 0 }
 204   // CHECK: @_ZN9MemberPtr2bjE ={{.*}} constant {{.*}} { i64 9, i64 0 }
 205   // CHECK: @_ZN9MemberPtr2bkE ={{.*}} constant {{.*}} { i64 {{.*}}1C1kEv{{.*}}, i64 0 }
 206   // CHECK: @_ZN9MemberPtr3b1lE ={{.*}} constant {{.*}} { i64 17, i64 0 }
 207   // CHECK: @_ZN9MemberPtr3b1mE ={{.*}} constant {{.*}} { i64 {{.*}}1D1mEv{{.*}}, i64 0 }
 208   // CHECK: @_ZN9MemberPtr3b2lE ={{.*}} constant {{.*}} { i64 17, i64 -24 }
 209   // CHECK: @_ZN9MemberPtr3b2mE ={{.*}} constant {{.*}} { i64 {{.*}}1D1mEv{{.*}}, i64 -24 }
 210   extern constexpr void (B1::*bf)()  = (void(B1::*)())&C::f;
 211   extern constexpr void (B1::*bg)()  = (void(B1::*)())&B1::g;
 212   extern constexpr void (B2::*bh)()  = (void(B2::*)())&B2::h;
 213   extern constexpr void (B2::*bi)()  = (void(B2::*)())&D::i;
 214   extern constexpr void (B1::*bj)()  = (void(B1::*)())&C::j;
 215   extern constexpr void (B1::*bk)()  = (void(B1::*)())&C::k;
 216   extern constexpr void (B1::*b1l)() = (void(B1::*)())&D::l;
 217   extern constexpr void (B1::*b1m)() = (void(B1::*)())&D::m;
 218   extern constexpr void (B2::*b2l)() = (void(B2::*)())&D::l;
 219   extern constexpr void (B2::*b2m)() = (void(B2::*)())&D::m;
 220 }
 221
 222 namespace LiteralReference {
 223   struct Lit {
 224     constexpr Lit() : n(5) {}
 225     int n;
 226   };
 227
 228   // This creates a non-const temporary and binds a reference to it.
 229   // CHECK: @[[TEMP:.*]] = internal global {{.*}} { i32 5 }, align 4
 230   // CHECK: @_ZN16LiteralReference3litE ={{.*}} constant {{.*}} @[[TEMP]], align 8
 231   const Lit &lit = Lit();
 232
 233   // This creates a const temporary as part of the reference initialization.
 234   // CHECK: @[[TEMP:.*]] = internal constant {{.*}} { i32 5 }, align 4
 235   // CHECK: @_ZN16LiteralReference4lit2E ={{.*}} constant {{.*}} @[[TEMP]], align 8
 236   const Lit &lit2 = {};
 237
 238   struct A { int &&r1; const int &&r2; };
 239   struct B { A &&a1; const A &&a2; };
 240   B b = { { 0, 1 }, { 2, 3 } };
 241   // CHECK: @[[TEMP0:.*]] = internal global i32 0, align 4
 242   // CHECK: @[[TEMP1:.*]] = internal constant i32 1, align 4
 243   // CHECK: @[[TEMPA1:.*]] = internal global {{.*}} { i32* @[[TEMP0]], i32* @[[TEMP1]] }, align 8
 244   // CHECK: @[[TEMP2:.*]] = internal global i32 2, align 4
 245   // CHECK: @[[TEMP3:.*]] = internal constant i32 3, align 4
 246   // CHECK: @[[TEMPA2:.*]] = internal constant {{.*}} { i32* @[[TEMP2]], i32* @[[TEMP3]] }, align 8
 247   // CHECK: @_ZN16LiteralReference1bE ={{.*}} global {{.*}} { {{.*}}* @[[TEMPA1]], {{.*}}* @[[TEMPA2]] }, align 8
 248
 249   struct Subobj {
 250     int a, b, c;
 251   };
 252   // CHECK: @[[TEMP:.*]] = internal global {{.*}} { i32 1, i32 2, i32 3 }, align 4
 253   // CHECK: @_ZN16LiteralReference2soE ={{.*}} constant {{.*}} (i8* getelementptr {{.*}} @[[TEMP]]{{.*}}, i64 4)
 254   constexpr int &&so = Subobj{ 1, 2, 3 }.b;
 255
 256   struct Dummy { int padding; };
 257   struct Derived : Dummy, Subobj {
 258     constexpr Derived() : Dummy{200}, Subobj{4, 5, 6} {}
 259   };
 260   using ConstDerived = const Derived;
 261   // CHECK: @[[TEMPCOMMA:.*]] = internal constant {{.*}} { i32 200, i32 4, i32 5, i32 6 }
 262   // CHECK: @_ZN16LiteralReference5commaE ={{.*}} constant {{.*}} getelementptr {{.*}} @[[TEMPCOMMA]]{{.*}}, i64 8)
 263   constexpr const int &comma = (1, (2, ConstDerived{}).b);
 264
 265   // CHECK: @[[TEMPDERIVED:.*]] = internal global {{.*}} { i32 200, i32 4, i32 5, i32 6 }
 266   // CHECK: @_ZN16LiteralReference4baseE ={{.*}} constant {{.*}} getelementptr {{.*}} @[[TEMPDERIVED]]{{.*}}, i64 4)
 267   constexpr Subobj &&base = Derived{};
 268
 269   // CHECK: @_ZN16LiteralReference7derivedE ={{.*}} constant {{.*}} @[[TEMPDERIVED]]
 270   constexpr Derived &derived = static_cast<Derived&>(base);
 271 }
 272
 273 namespace NonLiteralConstexpr {
 274   constexpr int factorial(int n) {
 275     return n ? factorial(n-1) * n : 1;
 276   }
 277   extern void f(int *p);
 278
 279   struct NonTrivialDtor {
 280     constexpr NonTrivialDtor() : n(factorial(5)), p(&n) {}
 281     ~NonTrivialDtor() {
 282       f(p);
 283     }
 284
 285     int n;
 286     int *p;
 287   };
 288   static_assert(!__is_literal(NonTrivialDtor), "");
 289   // CHECK: @_ZN19NonLiteralConstexpr3ntdE ={{.*}} global {{.*}} { i32 120, i32* getelementptr
 290   NonTrivialDtor ntd;
 291
 292   struct VolatileMember {
 293     constexpr VolatileMember() : n(5) {}
 294     volatile int n;
 295   };
 296   static_assert(!__is_literal(VolatileMember), "");
 297   // CHECK: @_ZN19NonLiteralConstexpr2vmE ={{.*}} global {{.*}} { i32 5 }
 298   VolatileMember vm;
 299
 300   struct Both {
 301     constexpr Both() : n(10) {}
 302     ~Both();
 303     volatile int n;
 304   };
 305   // CHECK: @_ZN19NonLiteralConstexpr1bE ={{.*}} global {{.*}} { i32 10 }
 306   Both b;
 307
 308   void StaticVars() {
 309     // CHECK: @_ZZN19NonLiteralConstexpr10StaticVarsEvE3ntd = {{.*}} { i32 120, i32* getelementptr {{.*}}
 310     // CHECK: @_ZGVZN19NonLiteralConstexpr10StaticVarsEvE3ntd =
 311     static NonTrivialDtor ntd;
 312     // CHECK: @_ZZN19NonLiteralConstexpr10StaticVarsEvE2vm = {{.*}} { i32 5 }
 313     // CHECK-NOT: @_ZGVZN19NonLiteralConstexpr10StaticVarsEvE2vm =
 314     static VolatileMember vm;
 315     // CHECK: @_ZZN19NonLiteralConstexpr10StaticVarsEvE1b = {{.*}} { i32 10 }
 316     // CHECK: @_ZGVZN19NonLiteralConstexpr10StaticVarsEvE1b =
 317     static Both b;
 318   }
 319 }
 320
 321 // PR12067
 322 namespace VirtualMembers {
 323   struct A {
 324     constexpr A(double d) : d(d) {}
 325     virtual void f();
 326     double d;
 327   };
 328   struct B : A {
 329     constexpr B() : A(2.0), c{'h', 'e', 'l', 'l', 'o'} {}
 330     constexpr B(int n) : A(n), c{'w', 'o', 'r', 'l', 'd'} {}
 331     virtual void g();
 332     char c[5];
 333   };
 334   struct C {
 335     constexpr C() : n(64) {}
 336     int n;
 337   };
 338   struct D : C, A, B {
 339     constexpr D() : A(1.0), B(), s(5) {}
 340     short s;
 341   };
 342   struct E : D, B {
 343     constexpr E() : B(3), c{'b','y','e'} {}
 344     char c[3];
 345   };
 346   // CHECK: @_ZN14VirtualMembers1eE ={{.*}} global { i8**, double, i32, i8**, double, [5 x i8], i16, i8**, double, [5 x i8], [3 x i8] } { i8** getelementptr inbounds ({ [3 x i8*], [4 x i8*], [4 x i8*] }, { [3 x i8*], [4 x i8*], [4 x i8*] }* @_ZTVN14VirtualMembers1EE, i32 0, inrange i32 0, i32 2), double 1.000000e+00, i32 64, i8** getelementptr inbounds ({ [3 x i8*], [4 x i8*], [4 x i8*] }, { [3 x i8*], [4 x i8*], [4 x i8*] }* @_ZTVN14VirtualMembers1EE, i32 0, inrange i32 1, i32 2), double 2.000000e+00, [5 x i8] c"hello", i16 5, i8** getelementptr inbounds ({ [3 x i8*], [4 x i8*], [4 x i8*] }, { [3 x i8*], [4 x i8*], [4 x i8*] }* @_ZTVN14VirtualMembers1EE, i32 0, inrange i32 2, i32 2), double 3.000000e+00, [5 x i8] c"world", [3 x i8] c"bye" }
 347   E e;
 348
 349   struct nsMemoryImpl {
 350     virtual void f();
 351   };
 352   // CHECK: @_ZN14VirtualMembersL13sGlobalMemoryE = internal global { i8** } { i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTVN14VirtualMembers12nsMemoryImplE, i32 0, inrange i32 0, i32 2) }
 353   __attribute__((used))
 354   static nsMemoryImpl sGlobalMemory;
 355
 356   template<class T>
 357   struct TemplateClass {
 358     constexpr TemplateClass() : t{42} {}
 359     virtual void templateMethod() {}
 360
 361     T t;
 362   };
 363   // CHECK: @_ZN14VirtualMembers1tE ={{.*}} global { i8**, i32 } { i8** getelementptr inbounds ({ [3 x i8*] }, { [3 x i8*] }* @_ZTVN14VirtualMembers13TemplateClassIiEE, i32 0, inrange i32 0, i32 2), i32 42 }
 364   TemplateClass<int> t;
 365 }
 366
 367 namespace PR13273 {
 368   struct U {
 369     int t;
 370     U() = default;
 371   };
 372
 373   struct S : U {
 374     S() = default;
 375   };
 376
 377   // CHECK: @_ZN7PR132731sE = {{.*}} zeroinitializer
 378   extern const S s {};
 379 }
 380
 381 namespace ArrayTemporary {
 382   struct A { const int (&x)[3]; };
 383   struct B { const A (&x)[2]; };
 384   // CHECK: @[[A1:_ZGRN14ArrayTemporary1bE.*]] = internal constant [3 x i32] [i32 1, i32 2, i32 3]
 385   // CHECK: @[[A2:_ZGRN14ArrayTemporary1bE.*]] = internal constant [3 x i32] [i32 4, i32 5, i32 6]
 386   // CHECK: @[[ARR:_ZGRN14ArrayTemporary1bE.*]] = internal constant [2 x {{.*}}] [{{.*}} { [3 x i32]* @[[A1]] }, {{.*}} { [3 x i32]* @[[A2]] }]
 387   // CHECK: @[[B:_ZGRN14ArrayTemporary1bE.*]] = internal global {{.*}} { [2 x {{.*}}]* @[[ARR]] }
 388   // CHECK: @_ZN14ArrayTemporary1bE ={{.*}} constant {{.*}}* @[[B]]
 389   B &&b = { { { { 1, 2, 3 } }, { { 4, 5, 6 } } } };
 390 }
 391
 392 namespace UnemittedTemporaryDecl {
 393   constexpr int &&ref = 0;
 394   extern constexpr int &ref2 = ref;
 395   // CHECK: @_ZGRN22UnemittedTemporaryDecl3refE_ = internal global i32 0
 396
 397   // FIXME: This declaration should not be emitted -- it isn't odr-used.
 398   // CHECK: @_ZN22UnemittedTemporaryDecl3refE
 399
 400   // CHECK: @_ZN22UnemittedTemporaryDecl4ref2E ={{.*}} constant i32* @_ZGRN22UnemittedTemporaryDecl3refE_
 401 }
 402
 403 namespace DR2126 {
 404   struct A { int &&b; };
 405   constexpr const A &a = {42};
 406   // CHECK: @_ZGRN6DR21261aE0_ = internal global i32 42
 407   // FIXME: This is unused and need not be emitted.
 408   // CHECK: @_ZGRN6DR21261aE_ = internal constant {{.*}} { i32* @_ZGRN6DR21261aE0_ }
 409   // CHECK: @_ZN6DR21261rE ={{.*}} constant i32* @_ZGRN6DR21261aE0_
 410   int &r = a.b;
 411
 412   // Dynamically initialized: the temporary object bound to 'b' could be
 413   // modified (eg, by placement 'new') before the initializer of 's' runs.
 414   constexpr A &&b = {42};
 415   // CHECK: @_ZN6DR21261sE ={{.*}} global i32* null
 416   int &s = b.b;
 417 }
 418
 419 // CHECK: @_ZZN12LocalVarInit3aggEvE1a = internal constant {{.*}} i32 101
 420 // CHECK: @_ZZN12LocalVarInit4ctorEvE1a = internal constant {{.*}} i32 102
 421 // CHECK: @__const._ZN12LocalVarInit8mutable_Ev.a = private unnamed_addr constant {{.*}} i32 103
 422 // CHECK: @_ZGRN33ClassTemplateWithStaticDataMember1SIvE1aE_ = linkonce_odr constant i32 5, comdat
 423 // CHECK: @_ZN33ClassTemplateWithStaticDataMember3useE ={{.*}} constant i32* @_ZGRN33ClassTemplateWithStaticDataMember1SIvE1aE_
 424 // CHECK: @_ZGRN39ClassTemplateWithHiddenStaticDataMember1SIvE1aE_ = linkonce_odr hidden constant i32 5, comdat
 425 // CHECK: @_ZN39ClassTemplateWithHiddenStaticDataMember3useE ={{.*}} constant i32* @_ZGRN39ClassTemplateWithHiddenStaticDataMember1SIvE1aE_
 426 // CHECK: @_ZGRZN20InlineStaticConstRef3funEvE1i_ = linkonce_odr constant i32 10, comdat
 427
 428 // Constant initialization tests go before this point,
 429 // dynamic initialization tests go after.
 430
 431 // We must emit a constant initializer for NonLiteralConstexpr::ntd, but also
 432 // emit an initializer to register its destructor.
 433 // CHECK: define {{.*}}cxx_global_var_init{{.*}}
 434 // CHECK-NOT: NonLiteralConstexpr
 435 // CHECK: call {{.*}}cxa_atexit{{.*}} @_ZN19NonLiteralConstexpr14NonTrivialDtorD1Ev {{.*}} @_ZN19NonLiteralConstexpr3ntdE
 436 // CHECK-NEXT: ret void
 437
 438 // We don't need to emit any dynamic initialization for NonLiteralConstexpr::vm.
 439 // CHECK-NOT: NonLiteralConstexpr2vm
 440
 441 // We must emit a constant initializer for NonLiteralConstexpr::b, but also
 442 // emit an initializer to register its destructor.
 443 // CHECK: define {{.*}}cxx_global_var_init{{.*}}
 444 // CHECK-NOT: NonLiteralConstexpr
 445 // CHECK: call {{.*}}cxa_atexit{{.*}} @_ZN19NonLiteralConstexpr4BothD1Ev {{.*}} @_ZN19NonLiteralConstexpr1bE
 446 // CHECK-NEXT: ret void
 447
 448 // CHECK: define {{.*}}NonLiteralConstexpr10StaticVars
 449 // CHECK-NOT: }
 450 // CHECK: call {{.*}}cxa_atexit{{.*}}@_ZN19NonLiteralConstexpr14NonTrivialDtorD1Ev
 451 // CHECK-NOT: }
 452 // CHECK: call {{.*}}cxa_atexit{{.*}}@_ZN19NonLiteralConstexpr4BothD1Ev
 453
 454 // PR12848: Don't emit dynamic initializers for local constexpr variables.
 455 namespace LocalVarInit {
 456   constexpr int f(int n) { return n; }
 457   struct Agg { int k; };
 458   struct Ctor { constexpr Ctor(int n) : k(n) {} int k; };
 459   struct Mutable { constexpr Mutable(int n) : k(n) {} mutable int k; };
 460
 461   // CHECK: define {{.*}} @_ZN12LocalVarInit6scalarEv
 462   // CHECK-NOT: call
 463   // CHECK: store i32 100,
 464   // CHECK-NOT: call
 465   // CHECK: ret i32 100
 466   int scalar() { constexpr int a = { f(100) }; return a; }
 467
 468   // CHECK: define {{.*}} @_ZN12LocalVarInit3aggEv
 469   // CHECK-NOT: call
 470   // CHECK: ret i32 101
 471   int agg() { constexpr Agg a = { f(101) }; return a.k; }
 472
 473   // CHECK: define {{.*}} @_ZN12LocalVarInit4ctorEv
 474   // CHECK-NOT: call
 475   // CHECK: ret i32 102
 476   int ctor() { constexpr Ctor a = { f(102) }; return a.k; }
 477
 478   // CHECK: define {{.*}} @_ZN12LocalVarInit8mutable_Ev
 479   // CHECK-NOT: call
 480   // CHECK: call {{.*}}memcpy{{.*}} @__const._ZN12LocalVarInit8mutable_Ev.a
 481   // CHECK-NOT: call
 482   // Can't fold return value due to 'mutable'.
 483   // CHECK-NOT: ret i32 103
 484   // CHECK: }
 485   int mutable_() { constexpr Mutable a = { f(103) }; return a.k; }
 486 }
 487
 488 namespace CrossFuncLabelDiff {
 489   // Make sure we refuse to constant-fold the variable b.
 490   constexpr long a(bool x) { return x ? 0 : (long)&&lbl + (0 && ({lbl: 0;})); }
 491   void test() { static long b = (long)&&lbl - a(false); lbl: return; }
 492   // CHECK: sub nsw i64 ptrtoint (i8* blockaddress(@_ZN18CrossFuncLabelDiff4testEv, {{.*}}) to i64),
 493   // CHECK: store i64 {{.*}}, i64* @_ZZN18CrossFuncLabelDiff4testEvE1b, align 8
 494 }
 495
 496 // PR12012
 497 namespace VirtualBase {
 498   struct B {};
 499   struct D : virtual B {};
 500   D d;
 501   // CHECK: call {{.*}}@_ZN11VirtualBase1DC1Ev
 502
 503   template<typename T> struct X : T {
 504     constexpr X() : T() {}
 505   };
 506   X<D> x;
 507   // CHECK: call {{.*}}@_ZN11VirtualBase1XINS_1DEEC1Ev
 508 }
 509
 510 // PR12145
 511 namespace Unreferenced {
 512   int n;
 513   constexpr int *p = &n;
 514   // We must not emit a load of 'p' here, since it's not odr-used.
 515   int q = *p;
 516   // CHECK-NOT: _ZN12Unreferenced1pE
 517   // CHECK: = load i32, i32* @_ZN12Unreferenced1nE
 518   // CHECK-NEXT: store i32 {{.*}}, i32* @_ZN12Unreferenced1qE
 519   // CHECK-NOT: _ZN12Unreferenced1pE
 520
 521   // Technically, we are not required to substitute variables of reference types
 522   // initialized by constant expressions, because the special case for odr-use
 523   // of variables in [basic.def.odr]p2 only applies to objects. But we do so
 524   // anyway.
 525
 526   constexpr int &r = n;
 527   // CHECK-NOT: _ZN12Unreferenced1rE
 528   int s = r;
 529
 530   const int t = 1;
 531   const int &rt = t;
 532   int f(int);
 533   int u = f(rt);
 534   // CHECK: call noundef i32 @_ZN12Unreferenced1fEi(i32 noundef 1)
 535 }
 536
 537 namespace InitFromConst {
 538   template<typename T> void consume(T);
 539
 540   const bool b = true;
 541   const int n = 5;
 542   constexpr double d = 4.3;
 543
 544   struct S { int n = 7; S *p = 0; };
 545   constexpr S s = S();
 546   const S &r = s;
 547   constexpr const S *p = &r;
 548   constexpr int S::*mp = &S::n;
 549   constexpr int a[3] = { 1, 4, 9 };
 550
 551   void test() {
 552     // CHECK: call void @_ZN13InitFromConst7consumeIbEEvT_(i1 noundef zeroext true)
 553     consume(b);
 554
 555     // CHECK: call void @_ZN13InitFromConst7consumeIiEEvT_(i32 noundef 5)
 556     consume(n);
 557
 558     // CHECK: call void @_ZN13InitFromConst7consumeIdEEvT_(double noundef 4.300000e+00)
 559     consume(d);
 560
 561     // CHECK: call void @_ZN13InitFromConst7consumeIRKNS_1SEEEvT_(%"struct.InitFromConst::S"* noundef nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) @_ZN13InitFromConstL1sE)
 562     consume<const S&>(s);
 563
 564     // CHECK: call void @_ZN13InitFromConst7consumeIRKNS_1SEEEvT_(%"struct.InitFromConst::S"* noundef nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) @_ZN13InitFromConstL1sE)
 565     consume<const S&>(r);
 566
 567     // CHECK: call void @_ZN13InitFromConst7consumeIPKNS_1SEEEvT_(%"struct.InitFromConst::S"* noundef @_ZN13InitFromConstL1sE)
 568     consume(p);
 569
 570     // CHECK: call void @_ZN13InitFromConst7consumeIMNS_1SEiEEvT_(i64 0)
 571     consume(mp);
 572
 573     // CHECK: call void @_ZN13InitFromConst7consumeIPKiEEvT_(i32* noundef getelementptr inbounds ([3 x i32], [3 x i32]* @_ZN13InitFromConstL1aE, i64 0, i64 0))
 574     consume(a);
 575   }
 576 }
 577
 578 namespace Null {
 579   decltype(nullptr) null();
 580   // CHECK: call {{.*}} @_ZN4Null4nullEv(
 581   int *p = null();
 582   struct S {};
 583   // CHECK: call {{.*}} @_ZN4Null4nullEv(
 584   int S::*q = null();
 585 }
 586
 587 namespace InlineStaticConstRef {
 588   inline const int &fun() {
 589     static const int &i = 10;
 590     return i;
 591     // CHECK: ret i32* @_ZGRZN20InlineStaticConstRef3funEvE1i_
 592   }
 593   const int &use = fun();
 594 }
 595
 596 namespace ClassTemplateWithStaticDataMember {
 597   template <typename T>
 598   struct S {
 599     static const int &a;
 600   };
 601   template <typename T>
 602   const int &S<T>::a = 5;
 603   const int &use = S<void>::a;
 604 }
 605
 606 namespace ClassTemplateWithHiddenStaticDataMember {
 607   template <typename T>
 608   struct S {
 609     __attribute__((visibility("hidden"))) static const int &a;
 610   };
 611   template <typename T>
 612   const int &S<T>::a = 5;
 613   const int &use = S<void>::a;
 614 }
 615
 616 namespace ClassWithStaticConstexprDataMember {
 617 struct X {
 618   static constexpr const char &p = 'c';
 619 };
 620
 621 // CHECK: @_ZGRN34ClassWithStaticConstexprDataMember1X1pE_
 622 const char *f() { return &X::p; }
 623 }
 624
 625 // VirtualMembers::TemplateClass::templateMethod() must be defined in this TU,
 626 // not just declared.
 627 // CHECK: define linkonce_odr void @_ZN14VirtualMembers13TemplateClassIiE14templateMethodEv(%"struct.VirtualMembers::TemplateClass"* {{[^,]*}} %this)