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

   1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -std=c++11 %s
   2 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -std=c++11 -Wno-return-stack-address -Wreturn-local-addr %s
   3
   4 namespace PR26599 {
   5 template <typename>
   6 struct S;
   7
   8 struct I {};
   9
  10 template <typename T>
  11 void *&non_pointer() {
  12   void *&r = S<T>()[I{}];
  13   return r;
  14 }
  15
  16 template <typename T>
  17 void *&pointer() {
  18   void *&r = S<T>()[nullptr];
  19   return r;
  20 }
  21 }
  22
  23 namespace LocalTemporary {
  24
  25 template <class T>
  26 class QMap {
  27 public:
  28   T value(const T &t = T()) const {
  29     return t;
  30   }
  31 };
  32
  33 struct A {};
  34
  35 void test() {
  36   QMap<A *> map;
  37   map.value();
  38 }
  39
  40 typedef int* ptr;
  41 ptr int1(const ptr &p = ptr()) {
  42   return (p);
  43 }
  44
  45 ptr int2(const ptr &p = nullptr) {
  46   return p;
  47 }
  48
  49 ptr int3() {
  50   const ptr &p = ptr();
  51   return p;
  52 }
  53
  54 const int *int4(const int &x = 5) {
  55   return &x;
  56 }
  57
  58 const int *int5(const int &x) {
  59   return &x;
  60 }
  61
  62 const int *int6() {
  63   const int &x = 11;  //expected-note{{binding reference variable 'x' here}}
  64   return &x;  //expected-warning{{returning address of local temporary object}}
  65 }
  66
  67 const int *int7(int x) {
  68   const int &x2 = x;  // expected-note{{binding reference variable 'x2' here}}
  69   return &x2;  //  expected-warning{{address of stack memory associated with parameter 'x' returned}}
  70 }
  71
  72 const int *int8(const int &x = 5) {
  73   const int &x2 = x;
  74   return &x2;
  75 }
  76
  77 const int *int9() {
  78   const int &x = 5;  // expected-note{{binding reference variable 'x' here}}
  79   const int &x2 = x;  // expected-note{{binding reference variable 'x2' here}}
  80   return &x2;  // expected-warning{{returning address of local temporary object}}
  81 }
  82 }