clang/test/CodeGenCXX/cxx11-extern-constexpr.cpp

   1 // RUN: %clang_cc1 -std=c++11 %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=X86,CXX11X86
   2 // RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=X86,CXX17X86
   3 // RUN: %clang_cc1 -std=c++11 %s -emit-llvm -o - -triple amdgcn-amd-amdhsa | FileCheck %s --check-prefixes=AMD,CXX11AMD
   4 // RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple amdgcn-amd-amdhsa | FileCheck %s --check-prefixes=AMD,CXX17AMD
   5
   6 struct A {
   7   static const int Foo = 123;
   8 };
   9 // X86: @_ZN1A3FooE ={{.*}} constant i32 123, align 4
  10 // AMD: @_ZN1A3FooE ={{.*}} addrspace(1) constant i32 123, align 4
  11 const int *p = &A::Foo; // emit available_externally
  12 const int A::Foo;       // convert to full definition
  13
  14 struct PODWithInit {
  15   int g = 42;
  16   char h = 43;
  17 };
  18 struct CreatePOD {
  19   // Deferred initialization of the structure here requires changing
  20   // the type of the global variable: the initializer list does not include
  21   // the tail padding.
  22   // CXX11X86: @_ZN9CreatePOD3podE = available_externally constant { i32, i8 } { i32 42, i8 43 },
  23   // CXX11AMD: @_ZN9CreatePOD3podE = available_externally addrspace(1) constant { i32, i8 } { i32 42, i8 43 },
  24   static constexpr PODWithInit pod{};
  25 };
  26 const int *p_pod = &CreatePOD::pod.g;
  27
  28 struct Bar {
  29   int b;
  30 };
  31
  32 struct MutableBar {
  33   mutable int b;
  34 };
  35
  36 struct Foo {
  37   // CXX11X86: @_ZN3Foo21ConstexprStaticMemberE = available_externally constant i32 42,
  38   // CXX17X86: @_ZN3Foo21ConstexprStaticMemberE = linkonce_odr constant i32 42,
  39   // CXX11AMD: @_ZN3Foo21ConstexprStaticMemberE = available_externally addrspace(4) constant i32 42,
  40   // CXX17AMD: @_ZN3Foo21ConstexprStaticMemberE = linkonce_odr addrspace(4) constant i32 42, comdat, align 4
  41   static constexpr int ConstexprStaticMember = 42;
  42   // X86: @_ZN3Foo17ConstStaticMemberE = available_externally constant i32 43,
  43   // AMD: @_ZN3Foo17ConstStaticMemberE = available_externally addrspace(4) constant i32 43,
  44   static const int ConstStaticMember = 43;
  45
  46   // CXX11X86: @_ZN3Foo23ConstStaticStructMemberE = available_externally constant %struct.Bar { i32 44 },
  47   // CXX17X86: @_ZN3Foo23ConstStaticStructMemberE = linkonce_odr constant %struct.Bar { i32 44 },
  48   // CXX11AMD: @_ZN3Foo23ConstStaticStructMemberE = available_externally addrspace(1) constant %struct.Bar { i32 44 },
  49   // CXX17AMD: @_ZN3Foo23ConstStaticStructMemberE = linkonce_odr addrspace(1) constant %struct.Bar { i32 44 },
  50   static constexpr Bar ConstStaticStructMember = {44};
  51
  52   // CXX11X86: @_ZN3Foo34ConstexprStaticMutableStructMemberE = external global %struct.MutableBar,
  53   // CXX17X86: @_ZN3Foo34ConstexprStaticMutableStructMemberE = linkonce_odr global %struct.MutableBar { i32 45 },
  54   // CXX11AMD: @_ZN3Foo34ConstexprStaticMutableStructMemberE = external addrspace(1) global %struct.MutableBar,
  55   // CXX17AMD: @_ZN3Foo34ConstexprStaticMutableStructMemberE = linkonce_odr addrspace(1) global %struct.MutableBar { i32 45 },
  56   static constexpr MutableBar ConstexprStaticMutableStructMember = {45};
  57 };
  58 // X86: @_ZL15ConstStaticexpr = internal constant i32 46,
  59 // AMD: @_ZL15ConstStaticexpr = internal addrspace(4) constant i32 46,
  60 static constexpr int ConstStaticexpr = 46;
  61 // X86: @_ZL9ConstExpr = internal constant i32 46, align 4
  62 // AMD: @_ZL9ConstExpr = internal addrspace(4) constant i32 46, align 4
  63 static const int ConstExpr = 46;
  64
  65 // X86: @_ZL21ConstexprStaticStruct = internal constant %struct.Bar { i32 47 },
  66 // AMD: @_ZL21ConstexprStaticStruct = internal addrspace(1) constant %struct.Bar { i32 47 },
  67 static constexpr Bar ConstexprStaticStruct = {47};
  68
  69 // X86: @_ZL28ConstexprStaticMutableStruct = internal global %struct.MutableBar { i32 48 },
  70 // AMD: @_ZL28ConstexprStaticMutableStruct = internal addrspace(1) global %struct.MutableBar { i32 48 },
  71 static constexpr MutableBar ConstexprStaticMutableStruct = {48};
  72
  73 void use(const int &);
  74 void foo() {
  75   use(Foo::ConstexprStaticMember);
  76   use(Foo::ConstStaticMember);
  77   use(Foo::ConstStaticStructMember.b);
  78   use(Foo::ConstexprStaticMutableStructMember.b);
  79   use(ConstStaticexpr);
  80   use(ConstExpr);
  81   use(ConstexprStaticStruct.b);
  82   use(ConstexprStaticMutableStruct.b);
  83 }