clang/test/SemaCXX/return-stack-addr-2.cpp

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -std=c++11 %s
   2
   3 namespace PR26599 {
   4 template <typename>
   5 struct S;
   6
   7 struct I {};
   8
   9 template <typename T>
  10 void *&non_pointer() {
  11   void *&r = S<T>()[I{}];
  12   return r;
  13 }
  14
  15 template <typename T>
  16 void *&pointer() {
  17   void *&r = S<T>()[nullptr];
  18   return r;
  19 }
  20 }
  21
  22 namespace LocalTemporary {
  23
  24 template <class T>
  25 class QMap {
  26 public:
  27   T value(const T &t = T()) const {
  28     return t;
  29   }
  30 };
  31
  32 struct A {};
  33
  34 void test() {
  35   QMap<A *> map;
  36   map.value();
  37 }
  38
  39 typedef int* ptr;
  40 ptr int1(const ptr &p = ptr()) {
  41   return (p);
  42 }
  43
  44 ptr int2(const ptr &p = nullptr) {
  45   return p;
  46 }
  47
  48 ptr int3() {
  49   const ptr &p = ptr();
  50   return p;
  51 }
  52
  53 const int *int4(const int &x = 5) {
  54   return &x;
  55 }
  56
  57 const int *int5(const int &x) {
  58   return &x;
  59 }
  60
  61 const int *int6() {
  62   const int &x = 11;  //expected-note{{binding reference variable 'x' here}}
  63   return &x;  //expected-warning{{returning address of local temporary object}}
  64 }
  65
  66 const int *int7(int x) {
  67   const int &x2 = x;  // expected-note{{binding reference variable 'x2' here}}
  68   return &x2;  //  expected-warning{{address of stack memory associated with parameter 'x' returned}}
  69 }
  70
  71 const int *int8(const int &x = 5) {
  72   const int &x2 = x;
  73   return &x2;
  74 }
  75
  76 const int *int9() {
  77   const int &x = 5;  // expected-note{{binding reference variable 'x' here}}
  78   const int &x2 = x;  // expected-note{{binding reference variable 'x2' here}}
  79   return &x2;  // expected-warning{{returning address of local temporary object}}
  80 }
  81 }