clang/test/Analysis/vla-overflow.c

   1 // RUN: %clang_analyze_cc1 -triple x86_64-pc-linux-gnu -analyzer-checker=core -verify %s
   2
   3 typedef unsigned long size_t;
   4 #define BIGINDEX 65536U
   5
   6 size_t check_VLA_overflow_sizeof(unsigned int x) {
   7   if (x == BIGINDEX) {
   8     // We expect here that size_t is a 64 bit value.
   9     // Size of this array should be the first to overflow.
  10     size_t s = sizeof(char[x][x][x][x]); // expected-warning{{Declared variable-length array (VLA) has too large size [core.VLASize]}}
  11     return s;
  12   }
  13   return 0;
  14 }
  15
  16 void check_VLA_overflow_typedef(void) {
  17   unsigned int x = BIGINDEX;
  18   typedef char VLA[x][x][x][x]; // expected-warning{{Declared variable-length array (VLA) has too large size [core.VLASize]}}
  19 }
  20
  21 void check_VLA_no_overflow(void) {
  22   unsigned int x = BIGINDEX;
  23   typedef char VLA[x][x][x][x - 1];
  24   typedef char VLA1[0xffffffffu];
  25 }