compiler-rt/test/ubsan/TestCases/Pointer/index-overflow.cpp

   1 // RUN: %clangxx -fsanitize=pointer-overflow %s -o %t
   2 // RUN: %run %t  2 2>&1 | FileCheck %s --implicit-check-not="runtime error:" --check-prefix=ERR2
   3 // RUN: %run %t  1 2>&1 | FileCheck %s --implicit-check-not="runtime error:" --check-prefix=ERR1
   4 // RUN: %run %t  0 2>&1 | FileCheck %s --implicit-check-not="runtime error:" --check-prefix=SAFE
   5 // RUN: %run %t -1 2>&1 | FileCheck %s --implicit-check-not="runtime error:" --check-prefix=SAFE
   6 // RUN: %run %t -2 2>&1 | FileCheck %s --implicit-check-not="runtime error:" --check-prefix=SAFE
   7
   8 #include <stdio.h>
   9 #include <stdint.h>
  10 #include <stdlib.h>
  11
  12 int main(int argc, char *argv[]) {
  13   // SAFE-NOT: runtime error
  14   // ERR2: runtime error: pointer index expression with base {{.*}} overflowed to
  15   // ERR2: runtime error: pointer index expression with base {{.*}} overflowed to
  16   // ERR1: runtime error: applying non-zero offset to non-null pointer 0x{{.*}} produced null pointer
  17   // ERR1: runtime error: applying non-zero offset to non-null pointer 0x{{.*}} produced null pointer
  18
  19   char *p = (char *)(UINTPTR_MAX);
  20
  21   printf("%p\n", p + atoi(argv[1]));
  22
  23   char *q = (char *)(UINTPTR_MAX);
  24
  25   printf("%p\n", p - (-atoi(argv[1])));
  26
  27   return 0;
  28 }