clang/test/CodeGenCXX/noescape.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -emit-llvm -fblocks -o - %s | FileCheck %s
   2
   3 struct S {
   4   int a[4];
   5   S(int *, int * __attribute__((noescape)));
   6   S &operator=(int * __attribute__((noescape)));
   7   void m0(int *, int * __attribute__((noescape)));
   8   virtual void vm1(int *, int * __attribute__((noescape)));
   9 };
  10
  11 // CHECK: define{{.*}} void @_ZN1SC2EPiS0_(ptr {{.*}}, {{.*}}, {{.*}} nocapture noundef {{%.*}})
  12 // CHECK: define{{.*}} void @_ZN1SC1EPiS0_(ptr {{.*}}, {{.*}}, {{.*}} nocapture noundef {{%.*}}) {{.*}} {
  13 // CHECK: call void @_ZN1SC2EPiS0_(ptr {{.*}}, {{.*}}, {{.*}} nocapture {{.*}})
  14
  15 S::S(int *, int * __attribute__((noescape))) {}
  16
  17 // CHECK: define {{.*}} ptr @_ZN1SaSEPi(ptr {{.*}}, {{.*}} nocapture noundef {{%.*}})
  18 S &S::operator=(int * __attribute__((noescape))) { return *this; }
  19
  20 // CHECK: define{{.*}} void @_ZN1S2m0EPiS0_(ptr {{.*}}, {{.*}} nocapture noundef {{%.*}})
  21 void S::m0(int *, int * __attribute__((noescape))) {}
  22
  23 // CHECK: define{{.*}} void @_ZN1S3vm1EPiS0_(ptr {{.*}}, {{.*}} nocapture noundef {{%.*}})
  24 void S::vm1(int *, int * __attribute__((noescape))) {}
  25
  26 // CHECK-LABEL: define{{.*}} void @_Z5test0P1SPiS1_(
  27 // CHECK: call void @_ZN1SC1EPiS0_(ptr {{.*}}, {{.*}}, {{.*}} nocapture noundef {{.*}})
  28 // CHECK: call {{.*}} ptr @_ZN1SaSEPi(ptr {{.*}}, {{.*}} nocapture noundef {{.*}})
  29 // CHECK: call void @_ZN1S2m0EPiS0_(ptr {{.*}}, {{.*}}, {{.*}} nocapture noundef {{.*}})
  30 // CHECK: call void {{.*}}(ptr {{.*}}, {{.*}}, {{.*}} nocapture noundef {{.*}})
  31 void test0(S *s, int *p0, int *p1) {
  32   S t(p0, p1);
  33   t = p1;
  34   s->m0(p0, p1);
  35   s->vm1(p0, p1);
  36 }
  37
  38 namespace std {
  39   typedef decltype(sizeof(0)) size_t;
  40 }
  41
  42 // CHECK: define {{.*}} @_ZnwmPv({{.*}}, {{.*}} nocapture {{.*}})
  43 void *operator new(std::size_t, void * __attribute__((noescape)) p) {
  44   return p;
  45 }
  46
  47 // CHECK-LABEL: define{{.*}} ptr @_Z5test1Pv(
  48 // CHECK: %call = call {{.*}} @_ZnwmPv({{.*}}, {{.*}} nocapture {{.*}})
  49 void *test1(void *p0) {
  50   return ::operator new(16, p0);
  51 }
  52
  53 // CHECK-LABEL: define{{.*}} void @_Z5test2PiS_(
  54 // CHECK: call void @"_ZZ5test2PiS_ENK3$_0clES_S_"({{.*}}, {{.*}}, {{.*}} nocapture {{.*}})
  55 // CHECK: define internal void @"_ZZ5test2PiS_ENK3$_0clES_S_"({{.*}}, {{.*}}, {{.*}} nocapture noundef {{%.*}})
  56 void test2(int *p0, int *p1) {
  57   auto t = [](int *, int * __attribute__((noescape))){};
  58   t(p0, p1);
  59 }
  60
  61 // CHECK-LABEL: define{{.*}} void @_Z5test3PFvU8noescapePiES_(
  62 // CHECK: call void {{.*}}(ptr nocapture noundef {{.*}})
  63 typedef void (*NoEscapeFunc)(__attribute__((noescape)) int *);
  64
  65 void test3(NoEscapeFunc f, int *p) {
  66   f(p);
  67 }
  68
  69 namespace TestByref {
  70
  71 struct S {
  72   S();
  73   ~S();
  74   S(const S &);
  75   int a;
  76 };
  77
  78 typedef void (^BlockTy)(void);
  79 S &getS();
  80 void noescapefunc(__attribute__((noescape)) BlockTy);
  81
  82 // Check that __block variables with reference types are handled correctly.
  83
  84 // CHECK: define{{.*}} void @_ZN9TestByref4testEv(
  85 // CHECK: %[[X:.*]] = alloca ptr, align 8
  86 // CHECK: %[[BLOCK:.*]] = alloca <{ ptr, i32, i32, ptr, ptr, ptr }>, align 8
  87 // CHECK: %[[BLOCK_CAPTURED:.*]] = getelementptr inbounds <{ ptr, i32, i32, ptr, ptr, ptr }>, ptr %[[BLOCK]], i32 0, i32 5
  88 // CHECK: %[[V0:.*]] = load ptr, ptr %[[X]], align 8
  89 // CHECK: store ptr %[[V0]], ptr %[[BLOCK_CAPTURED]], align 8
  90
  91 void test() {
  92   __block S &x = getS();
  93   noescapefunc(^{ (void)x; });
  94 }
  95
  96 }