gcc/testsuite/gcc.dg/uninit-pr95136.c

   1 /* PR middle-end/95136 - missing -Wuninitialized on an array access with
   2    a variable offset
   3    { dg-do compile }
   4    { dg-options "-O -Wall" } */
   5
   6 #define NOIPA __attribute__ ((noipa))
   7
   8 NOIPA int a1_addr_varidx_plus_cst (int i)
   9 {
  10   int a[4];              // { dg-message "'a' declared here" }
  11   int *p = &a[i + 1];
  12   return *p;             // { dg-warning "'a|a\\\[<unknown>]' is used uninitialized" }
  13 }
  14
  15 NOIPA int a1_plus_addr_varidx_cst (int i)
  16 {
  17   int a[4];              // { dg-message "'a' declared here" }
  18   int *p = &a[i] + 1;
  19   return *p;             // { dg-warning "'a' is used uninitialized" }
  20 }
  21
  22 NOIPA int a1_plus_addr_cstidx_var (int i)
  23 {
  24   int a[4];              // { dg-message "'a' declared here" }
  25   int *p = &a[1] + i;
  26   return *p;             // { dg-warning "'a' is used uninitialized" }
  27 }
  28
  29 NOIPA int a1_plus_addr_varidx_var (int i, int j)
  30 {
  31   int a[4];              // { dg-message "'a' declared here" }
  32   int *p = &a[i] + j;
  33   return *p;             // { dg-warning "'a' is used uninitialized" }
  34 }
  35
  36
  37 NOIPA int a2_addr_varidx_plus_cst (int i, int j)
  38 {
  39   int a[4][4];           // { dg-message "'a' declared here" }
  40   int *p = &a[i + 1][j + 1];
  41   return *p;             // { dg-warning "'a|a\\\[<unknown>]\\\[<unknown>]' is used uninitialized" }
  42 }
  43
  44 NOIPA int a2_plus_addr_varidx_cst (int i, int j)
  45 {
  46   int a[4][4];           // { dg-message "'a' declared here" }
  47   int *p = &a[i][j] + 1;
  48   return *p;             // { dg-warning "'a' is used uninitialized" }
  49 }
  50
  51 NOIPA int a2_plus_addr_cstidx_var (int i)
  52 {
  53   int a[4][4];           // { dg-message "'a' declared here" }
  54   int *p = &a[1][1] + i;
  55   return *p;             // { dg-warning "'a' is used uninitialized" }
  56 }
  57
  58 NOIPA int a2_plus_addr_varidx_var (int i, int j, int k)
  59 {
  60   int a[4][4];           // { dg-message "'a' declared here" }
  61   int *p = &a[i][j] + k;
  62   return *p;             // { dg-warning "'a' is used uninitialized" }
  63 }