gcc/testsuite/gcc.dg/uninit-pr101494.c

   1 /* PR middle-end/101494 - bogus -Wmaybe-uninitialized on memrchr of size 0
   2    { dg-do compile }
   3    { dg-options "-O2 -Wall" }
   4    { dg-require-effective-target alloca } */
   5
   6 typedef __SIZE_TYPE__ size_t;
   7
   8 void* alloca (size_t);
   9
  10 __attribute__ ((malloc, alloc_size (1))) void* alloc (size_t);
  11
  12 __attribute__ ((access (read_only, 1, 2))) void* sink (void*, size_t);
  13
  14 void test_alloca_zero (size_t i)
  15 {
  16   char *p = alloca (0);
  17   sink (p, 0);      // { dg-bogus "\\\[-Wuninitialized" }
  18 }
  19
  20 void test_alloca_zero_pi (size_t i)
  21 {
  22   char *p = alloca (0);
  23   sink (p + i, 0);
  24 }
  25
  26 void test_alloca_cst (void)
  27 {
  28   char *p = alloca (7);
  29   sink (p, 0);      // { dg-bogus "\\\[-Wuninitialized" }
  30 }
  31
  32 void test_alloca_cst_p1 (void)
  33 {
  34   char *p = alloca (7);
  35   sink (p + 1, 0);  // { dg-bogus "\\\[-Wuninitialized" }
  36 }
  37
  38 void test_alloca_cst_p7 (void)
  39 {
  40   char *p = alloca (7);
  41   sink (p + 7, 0);  // { dg-bogus "\\\[-Wuninitialized" }
  42 }
  43
  44 void test_alloca_var (size_t n)
  45 {
  46   char *p = alloca (n);
  47   sink (p, 0);      // { dg-bogus "\\\[-Wuninitialized" }
  48 }
  49
  50 void test_alloca_var_p1 (size_t n)
  51 {
  52   char *p = alloca (n);
  53   sink (p + 1, 0);  // { dg-bogus "\\\[-Wuninitialized" }
  54 }
  55
  56 void test_alloca_var_pn (size_t n)
  57 {
  58   char *p = alloca (n);
  59   sink (p + n, 0);  // { dg-bogus "\\\[-Wuninitialized" }
  60 }
  61