clang/test/SemaCXX/warn-unsafe-buffer-usage-fixits-unevaluated-context.cpp

   1 // RUN: %clang_cc1 -std=c++20 -Wunsafe-buffer-usage \
   2 // RUN:            -fsafe-buffer-usage-suggestions \
   3 // RUN:            -fdiagnostics-parseable-fixits \
   4 // RUN:            -fsyntax-only %s 2>&1 | FileCheck %s
   5
   6 namespace std {
   7   class type_info;
   8   class bad_cast;
   9   class bad_typeid;
  10 }
  11 using size_t = __typeof(sizeof(int));
  12 void *malloc(size_t);
  13
  14 void foo(...);
  15 int bar(int *ptr);
  16
  17 void uneval_context_fix_pointer_dereference() {
  18   int* p = new int[10];
  19   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:3-[[@LINE-1]]:11}:"std::span<int> p"
  20   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:12-[[@LINE-2]]:12}:"{"
  21   // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:23-[[@LINE-3]]:23}:", 10}"
  22
  23   int tmp = p[5];
  24   typeid(foo(*p));
  25   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:14-[[@LINE-1]]:15}:""
  26   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:16-[[@LINE-2]]:16}:"[0]"
  27   _Generic(*p, int: 2, float: 3);
  28   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:12-[[@LINE-1]]:13}:""
  29   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:14-[[@LINE-2]]:14}:"[0]"
  30 }
  31
  32 void uneval_context_fix_pointer_array_access() {
  33   int* p = new int[10];
  34   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:3-[[@LINE-1]]:11}:"std::span<int> p"
  35   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:12-[[@LINE-2]]:12}:"{"
  36   // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:23-[[@LINE-3]]:23}:", 10}"
  37
  38   int tmp = p[5];
  39   typeid(foo(p[5]));
  40   _Generic(p[2], int: 2, float: 3);
  41 }
  42
  43 void uneval_context_fix_pointer_reference() {
  44   int* p = new int[10];
  45   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:3-[[@LINE-1]]:11}:"std::span<int> p"
  46   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:12-[[@LINE-2]]:12}:"{"
  47   // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:23-[[@LINE-3]]:23}:", 10}"
  48
  49   int tmp = p[5];
  50   typeid(bar(p));
  51   // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:15-[[@LINE-1]]:15}:".data()"
  52 }
  53
  54 // The FixableGagdtes are not working in the following scenarios:
  55 // 1. sizeof(DRE)
  56 // 2. typeid(DRE)
  57 // 3. __typeof(DRE)
  58 // 4. _Generic(expr, type_1: DRE, type_2:)
  59 // 5. decltype(DRE) var = y;
  60 // 6. noexcept(DRE);
  61 // This is becauste the UPC and ULC context matchers do not handle these contexts
  62 // and almost all FixableGagdets currently depend on these matchers.
  63
  64 // FIXME: Emit fixits for each of the below use.
  65 void uneval_context_fix_pointer_dereference_not_handled() {
  66   int* p = new int[10];
  67   int tmp = p[5];
  68
  69   foo(sizeof(*p), sizeof(decltype(*p)));
  70   __typeof(*p) x;
  71   int *q = (int *)malloc(sizeof(*p));
  72   int y = sizeof(*p);
  73   __is_pod(__typeof(*p));
  74   __is_trivially_constructible(__typeof(*p), decltype(*p));
  75   _Generic(*p, int: 2, float: 3);
  76   _Generic(1, int: *p, float: 3);
  77   _Generic(1, int: 2, float: *p);
  78   decltype(*p) var = y;
  79   noexcept(*p);
  80   typeid(*p);
  81 }
  82