test/Sema/array-bounds-ptr-arith.c

// RUN: %clang_cc1 -verify=expected        -Warray-bounds-pointer-arithmetic %s
// RUN: %clang_cc1 -verify=expected        -Warray-bounds-pointer-arithmetic %s -fstrict-flex-arrays=0
// RUN: %clang_cc1 -verify=expected,strict -Warray-bounds-pointer-arithmetic %s -fstrict-flex-arrays=2
// RUN: %clang_cc1 -verify=expected,strict -Warray-bounds-pointer-arithmetic %s -fstrict-flex-arrays=3

// Test case from PR10615
struct ext2_super_block{
  unsigned char s_uuid[8]; // expected-note {{declared here}}
  int ignored; // Prevents "s_uuid" from being treated as a flexible array
               // member.
};

void* ext2_statfs (struct ext2_super_block *es,int a) {
  return (void *)es->s_uuid + sizeof(int); // no-warning
}
void* broken (struct ext2_super_block *es,int a) {
  return (void *)es->s_uuid + 9; // expected-warning {{the pointer incremented by 9 refers past the end of the array (that has type 'unsigned char[8]')}}
}

// Test case reduced from PR11594
struct S {
  int n;
};
void pr11594(struct S *s) {
  int a[10];
  int *p = a - s->n;
}

// This resulted in an assertion failure because of the typedef instead of an
// explicit constant array type.
struct RDar11387038 {};
typedef struct RDar11387038 RDar11387038Array[1];
struct RDar11387038_Table {
  RDar11387038Array z; // strict-note {{array 'z' declared here}}
};
typedef struct RDar11387038_Table *TPtr;
typedef TPtr *TabHandle;
struct RDar11387038_B {
  TabHandle x;
};
typedef struct RDar11387038_B RDar11387038_B;

void radar11387038(void) {
  RDar11387038_B *pRDar11387038_B;
  struct RDar11387038 *y = &(*pRDar11387038_B->x)->z[4]; // strict-warning {{array index 4 is past the end of the array (that has type 'struct RDar11387038[1]')}}
}

void pr51682(void) {
  int arr[1];
  switch (0) {
  case 0:
    break;
  case 1:
    asm goto("" ::"r"(arr[42] >> 1)::failed);
    break;
  }
failed:;
}