clang/test/CodeGenCXX/delete.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 %s -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,CHECK-NOSIZE
   2 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 %s -emit-llvm -o - -Oz -disable-llvm-passes | FileCheck %s --check-prefixes=CHECK,CHECK-SIZE
   3
   4 void t1(int *a) {
   5   delete a;
   6 }
   7
   8 struct S {
   9   int a;
  10 };
  11
  12 // POD types.
  13
  14 // CHECK-LABEL: define{{.*}} void @_Z2t3P1S
  15 void t3(S *s) {
  16   // CHECK: icmp {{.*}} null
  17   // CHECK: br i1
  18
  19   // CHECK: call void @_ZdlPv
  20
  21   // Check the delete is inside the 'if !null' check unless we're optimizing
  22   // for size. FIXME: We could omit the branch entirely in this case.
  23   // CHECK-NOSIZE-NEXT: br
  24   // CHECK-SIZE-NEXT: ret
  25   delete s;
  26 }
  27
  28 // Non-POD
  29 struct T {
  30   ~T();
  31   int a;
  32 };
  33
  34 // CHECK-LABEL: define{{.*}} void @_Z2t4P1T
  35 void t4(T *t) {
  36   // CHECK: call void @_ZN1TD1Ev
  37   // CHECK-SIZE-NEXT: br
  38   // CHECK: call void @_ZdlPv
  39   delete t;
  40 }
  41
  42 // PR5102
  43 template <typename T>
  44 class A {
  45   public: operator T *() const;
  46 };
  47
  48 void f() {
  49   A<char*> a;
  50
  51   delete a;
  52 }
  53
  54 namespace test0 {
  55   struct A {
  56     void *operator new(__SIZE_TYPE__ sz);
  57     void operator delete(void *p) { ::operator delete(p); }
  58     ~A() {}
  59   };
  60
  61   // CHECK-LABEL: define{{.*}} void @_ZN5test04testEPNS_1AE(
  62   void test(A *a) {
  63     // CHECK: call void @_ZN5test01AD1Ev
  64     // CHECK-SIZE-NEXT: br
  65     // CHECK: call void @_ZN5test01AdlEPv
  66     delete a;
  67   }
  68
  69   // CHECK-LABEL: define linkonce_odr void @_ZN5test01AD1Ev(ptr {{[^,]*}} %this) unnamed_addr
  70   // CHECK-LABEL: define linkonce_odr void @_ZN5test01AdlEPv
  71 }
  72
  73 namespace test1 {
  74   struct A {
  75     int x;
  76     ~A();
  77   };
  78
  79   // CHECK-LABEL: define{{.*}} void @_ZN5test14testEPA10_A20_NS_1AE(
  80   void test(A (*arr)[10][20]) {
  81     delete [] arr;
  82     // CHECK:      icmp eq ptr [[PTR:%.*]], null
  83     // CHECK-NEXT: br i1
  84
  85     // CHECK:      [[BEGIN:%.*]] = getelementptr inbounds [10 x [20 x [[A:%.*]]]], ptr [[PTR]], i32 0, i32 0, i32 0
  86     // CHECK-NEXT: [[ALLOC:%.*]] = getelementptr inbounds i8, ptr [[BEGIN]], i64 -8
  87     // CHECK-NEXT: [[COUNT:%.*]] = load i64, ptr [[ALLOC]]
  88     // CHECK:      [[END:%.*]] = getelementptr inbounds [[A]], ptr [[BEGIN]], i64 [[COUNT]]
  89     // CHECK-NEXT: [[ISEMPTY:%.*]] = icmp eq ptr [[BEGIN]], [[END]]
  90     // CHECK-NEXT: br i1 [[ISEMPTY]],
  91     // CHECK:      [[PAST:%.*]] = phi ptr [ [[END]], {{%.*}} ], [ [[CUR:%.*]], {{%.*}} ]
  92     // CHECK-NEXT: [[CUR:%.*]] = getelementptr inbounds [[A]], ptr [[PAST]], i64 -1
  93     // CHECK-NEXT: call void @_ZN5test11AD1Ev(ptr {{[^,]*}} [[CUR]])
  94     // CHECK-NEXT: [[ISDONE:%.*]] = icmp eq ptr [[CUR]], [[BEGIN]]
  95     // CHECK-NEXT: br i1 [[ISDONE]]
  96     // CHECK:      call void @_ZdaPv(ptr noundef [[ALLOC]])
  97   }
  98 }
  99
 100 namespace test2 {
 101   // CHECK-LABEL: define{{.*}} void @_ZN5test21fEPb
 102   void f(bool *b) {
 103     // CHECK: call void @_ZdlPv(ptr
 104     delete b;
 105     // CHECK: call void @_ZdaPv(ptr
 106     delete [] b;
 107   }
 108 }
 109
 110 namespace test3 {
 111   void f(int a[10][20]) {
 112     // CHECK: call void @_ZdaPv(ptr
 113     delete a;
 114   }
 115 }
 116
 117 namespace test4 {
 118   // PR10341: ::delete with a virtual destructor
 119   struct X {
 120     virtual ~X();
 121     void operator delete (void *);
 122   };
 123
 124   // CHECK-LABEL: define{{.*}} void @_ZN5test421global_delete_virtualEPNS_1XE
 125   void global_delete_virtual(X *xp) {
 126     //   Load the offset-to-top from the vtable and apply it.
 127     //   This has to be done first because the dtor can mess it up.
 128     // CHECK: [[XP:%.*]] = load ptr, ptr [[XP_ADDR:%.*]]
 129     // CHECK: [[VTABLE:%.*]] = load ptr, ptr [[XP]]
 130     // CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds i64, ptr [[VTABLE]], i64 -2
 131     // CHECK-NEXT: [[OFFSET:%.*]] = load i64, ptr [[T0]], align 8
 132     // CHECK-NEXT: [[ALLOCATED:%.*]] = getelementptr inbounds i8, ptr [[XP]], i64 [[OFFSET]]
 133     //   Load the complete-object destructor (not the deleting destructor)
 134     //   and call noundef it.
 135     // CHECK-NEXT: [[VTABLE:%.*]] = load ptr, ptr [[XP:%.*]]
 136     // CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds ptr, ptr [[VTABLE]], i64 0
 137     // CHECK-NEXT: [[DTOR:%.*]] = load ptr, ptr [[T0]]
 138     // CHECK-NEXT: call void [[DTOR]](ptr {{[^,]*}} [[OBJ:%.*]])
 139     //   Call the global operator delete.
 140     // CHECK-NEXT: call void @_ZdlPv(ptr noundef [[ALLOCATED]]) [[NUW:#[0-9]+]]
 141     ::delete xp;
 142   }
 143 }
 144
 145 namespace test5 {
 146   struct Incomplete;
 147   // CHECK-LABEL: define{{.*}} void @_ZN5test523array_delete_incompleteEPNS_10IncompleteES1_
 148   void array_delete_incomplete(Incomplete *p1, Incomplete *p2) {
 149     // CHECK: call void @_ZdlPv
 150     delete p1;
 151     // CHECK: call void @_ZdaPv
 152     delete [] p2;
 153   }
 154 }
 155
 156 // CHECK: attributes [[NUW]] = {{[{].*}} nounwind {{.*[}]}}