clang/test/CodeGenCXX/arm64.cpp

   1 // RUN: %clang_cc1 -no-opaque-pointers %s -triple=arm64-apple-ios -emit-llvm -o - | FileCheck %s
   2 // RUN: %clang_cc1 -no-opaque-pointers %s -triple=arm64-apple-ios -emit-llvm -o - | FileCheck -check-prefix=CHECK-GLOBALS %s
   3
   4 // __cxa_guard_acquire argument is 64-bit
   5 // rdar://11540122
   6 struct A {
   7   A();
   8 };
   9
  10 void f() {
  11   // CHECK: call i32 @__cxa_guard_acquire(i64*
  12   static A a;
  13 }
  14
  15 // ARM64 uses the C++11 definition of POD.
  16 // rdar://12650514
  17 namespace test1 {
  18   // This class is POD in C++11 and cannot have objects allocated in
  19   // its tail-padding.
  20   struct ABase {};
  21   struct A : ABase {
  22     int x;
  23     char c;
  24   };
  25
  26   struct B : A {
  27     char d;
  28   };
  29
  30   int test() {
  31     return sizeof(B);
  32   }
  33   // CHECK: define{{.*}} i32 @_ZN5test14testEv()
  34   // CHECK: ret i32 12
  35 }
  36
  37 namespace std {
  38   class type_info;
  39 }
  40
  41 // ARM64 uses string comparisons for what would otherwise be
  42 // default-visibility weak RTTI.  rdar://12650568
  43 namespace test2 {
  44   struct A {
  45     virtual void foo();
  46   };
  47   void A::foo() {}
  48   // CHECK-GLOBALS-DAG: @_ZTSN5test21AE ={{.*}} constant [11 x i8]
  49   // CHECK-GLOBALS-DAG: @_ZTIN5test21AE ={{.*}} constant { {{.*}}, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @_ZTSN5test21AE, i32 0, i32 0) }
  50
  51   struct __attribute__((visibility("hidden"))) B {};
  52   const std::type_info &b0 = typeid(B);
  53   // CHECK-GLOBALS-DAG: @_ZTSN5test21BE = linkonce_odr hidden constant
  54   // CHECK-GLOBALS-DAG: @_ZTIN5test21BE = linkonce_odr hidden constant { {{.*}}, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @_ZTSN5test21BE, i32 0, i32 0) }
  55
  56   const std::type_info &b1 = typeid(B*);
  57   // CHECK-GLOBALS-DAG: @_ZTSPN5test21BE = linkonce_odr hidden constant
  58   // CHECK-GLOBALS-DAG: @_ZTIPN5test21BE = linkonce_odr hidden constant { {{.*}}, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @_ZTSPN5test21BE, i32 0, i32 0), i32 0, i8* bitcast
  59
  60   struct C {};
  61   const std::type_info &c0 = typeid(C);
  62   // CHECK-GLOBALS-DAG: @_ZTSN5test21CE = linkonce_odr hidden constant
  63   // CHECK-GLOBALS-DAG: @_ZTIN5test21CE = linkonce_odr hidden constant { {{.*}}, i8* inttoptr (i64 add (i64 ptrtoint ([11 x i8]* @_ZTSN5test21CE to i64), i64 -9223372036854775808) to i8*) }
  64
  65   const std::type_info &c1 = typeid(C*);
  66   // CHECK-GLOBALS-DAG: @_ZTSPN5test21CE = linkonce_odr hidden constant
  67   // CHECK-GLOBALS-DAG: @_ZTIPN5test21CE = linkonce_odr hidden constant { {{.*}}, i8* inttoptr (i64 add (i64 ptrtoint ([12 x i8]* @_ZTSPN5test21CE to i64), i64 -9223372036854775808) to i8*), i32 0, i8* bitcast
  68
  69   // This class is explicitly-instantiated, but that instantiation
  70   // doesn't guarantee to emit RTTI, so we can still demote the visibility.
  71   template <class T> class D {};
  72   template class D<int>;
  73   const std::type_info &d0 = typeid(D<int>);
  74   // CHECK-GLOBALS-DAG: @_ZTSN5test21DIiEE = linkonce_odr hidden constant
  75   // CHECK-GLOBALS-DAG: @_ZTIN5test21DIiEE = linkonce_odr hidden constant { {{.*}}, i8* inttoptr (i64 add (i64 ptrtoint ([14 x i8]* @_ZTSN5test21DIiEE to i64), i64 -9223372036854775808) to i8*) }
  76
  77   // This class is explicitly-instantiated and *does* guarantee to
  78   // emit RTTI, so we're stuck with having to use default visibility.
  79   template <class T> class E {
  80     virtual void foo() {}
  81   };
  82   template class E<int>;
  83   // CHECK-GLOBALS-DAG: @_ZTSN5test21EIiEE = weak_odr constant [14 x i8]
  84   // CHECK-GLOBALS-DAG: @_ZTIN5test21EIiEE = weak_odr constant { {{.*}}, i8* inttoptr (i64 add (i64 ptrtoint ([14 x i8]* @_ZTSN5test21EIiEE to i64), i64 -9223372036854775808) to i8*) }
  85
  86 }
  87
  88 // ARM64 reserves the top half of the vtable offset in virtual
  89 // member pointers.
  90 namespace test3 {
  91   struct A {
  92     virtual void foo();
  93     virtual void bar();
  94   };
  95
  96   // The offset half of the pointer is still initialized to zero.
  97   // CHECK-GLOBALS-DAG: @_ZN5test34mptrE ={{.*}} global { i64, i64 } { i64 0, i64 1 }
  98   void (A::*mptr)() = &A::foo;
  99
 100   // CHECK-LABEL: define{{.*}} void @_ZN5test34testEv()
 101   // CHECK:       [[TEMP:%.*]] = alloca [[A:.*]], align 8
 102   // CHECK:       [[MEMPTR:%.*]] = load { i64, i64 }, { i64, i64 }* @_ZN5test34mptrE, align 8
 103   // CHECK:       [[ADJUST_AND_IS_VIRTUAL:%.*]] = extractvalue { i64, i64 } [[MEMPTR]], 1
 104   // CHECK:       [[ADJUST:%.*]] = ashr i64 [[ADJUST_AND_IS_VIRTUAL]], 1
 105   // CHECK:       [[T0:%.*]] = bitcast [[A]]* [[TEMP]] to i8*
 106   // CHECK:       [[T1:%.*]] = getelementptr inbounds i8, i8* [[T0]], i64 [[ADJUST]]
 107   // CHECK:       [[ADJUSTED:%.*]] = bitcast i8* [[T1]] to [[A]]*
 108   // CHECK:       [[MEMBER:%.*]] = extractvalue { i64, i64 } [[MEMPTR]], 0
 109   // CHECK:       [[T0:%.*]] = and i64 [[ADJUST_AND_IS_VIRTUAL]], 1
 110   // CHECK:       [[IS_VIRTUAL:%.*]] = icmp ne i64 [[T0]], 0
 111   // CHECK:       br i1 [[IS_VIRTUAL]],
 112   // CHECK:       [[T0:%.*]] = bitcast [[A]]* [[ADJUSTED]] to i8**
 113   // CHECK:       [[VPTR:%.*]] = load i8*, i8** [[T0]], align 8
 114   // CHECK:       [[TRUNC:%.*]] = trunc i64 [[MEMBER]] to i32
 115   // CHECK:       [[ZEXT:%.*]] = zext i32 [[TRUNC]] to i64
 116   // CHECK:       [[T0:%.*]] = getelementptr i8, i8* [[VPTR]], i64 [[ZEXT]]
 117   // CHECK:       [[T1:%.*]] = bitcast i8* [[T0]] to void ([[A]]*)**
 118   // CHECK:       load void ([[A]]*)*, void ([[A]]*)** [[T1]],
 119   void test() {
 120     (A().*mptr)();
 121   }
 122 }