infer_clone/infer/tests/codetoanalyze/c/bufferoverrun/prune_alias.c

/*
 * Copyright (c) 2017-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
void prune_alias_le_Ok(int x) {
  int a[1];

  if (x <= x) {
    a[0] = 0;
  } else {
    a[1] = 0;
  }
}

void prune_alias_ge_Ok(int x) {
  int a[1];

  if (x >= x) {
    a[0] = 0;
  } else {
    a[1] = 0;
  }
}

void prune_alias_eq_Ok(int x) {
  int a[1];

  if (x == x) {
    a[0] = 0;
  } else {
    a[1] = 0;
  }
}

void prune_alias_lt_Ok(int x) {
  int a[1];

  if (x < x) {
    a[1] = 0;
  }
}

void prune_alias_gt_Ok(int x) {
  int a[1];

  if (x > x) {
    a[1] = 0;
  }
}

void prune_alias_ne_Ok(int x) {
  int a[1];

  if (x != x) {
    a[1] = 0;
  }
}

void prune_alias_not_Ok(int x) {
  int a[1];

  if (!(x == x)) {
    a[1] = 0;
  }

  if (!(x <= x)) {
    a[1] = 0;
  }

  if (!(x >= x)) {
    a[1] = 0;
  }
}

void prune_alias_and_Ok(int x) {
  int a[1];

  if (x == x && x != x) {
    a[1] = 0;
  }
}

void prune_alias_or_Ok(int x, int y) {
  int a[1];

  if (x != x || y != y) {
    a[1] = 0;
  }
}

void prune_alias_exp_Ok(int x) {
  int a[1];

  if (x + 1 != x + 1) {
    a[1] = 0;
  }
}

void FP_prune_alias_exp_Ok(int x) {
  int a[1];

  if (x + 1 != 1 + x) {
    a[1] = 0;
  }
}

#include <stdlib.h>

void prune_arrblk_ne(int* x) {
  int* y = x + 10;

  if (x != y) {
    x[5] = 1;
  }
}

void call_prune_arrblk_ne_Ok() {
  int* x = (int*)malloc(sizeof(int) * 10);
  prune_arrblk_ne(x);
}

void call_prune_arrblk_ne_Bad() {
  int* x = (int*)malloc(sizeof(int) * 5);
  prune_arrblk_ne(x);
}

void prune_arrblk_eq(int* x) {
  int* y = x + 10;

  if (x == y) {
    x[5] = 1; /* unreachable */
  }
}

void call_prune_arrblk_eq_Ok() {
  int* x = (int*)malloc(sizeof(int) * 5);
  prune_arrblk_eq(x);
}

void prune_minmax1_Ok(unsigned int x, unsigned int y) {
  if (x > 0) {
    if (y >= x + 1) {
      unsigned int z = y - 1;
    }
  }
}

void call_prune_minmax1_Ok() { prune_minmax1_Ok(0, 0); }

void prune_minmax2_Ok(unsigned int x, unsigned int y) {
  if (x > y) {
    unsigned int z = x - y;
  }
}

void call_prune_minmax2_Ok() { prune_minmax2_Ok(0, 2); }

void loop_prune_Good(int length, int j) {
  int i;
  char a[length];

  for (i = length - 1; i >= 0; i--) {
    if (j >= 0 && j < i) {
      /* here we always have i >= 1 */
      a[length - i] = 'Z';
    }
  }
}

void loop_prune2_Good_FP(int length, int j) {
  int i;
  char a[length];

  for (i = length - 1; i >= 0; i--) {
    /* need a relational domain */
    if (j < i && j >= 0) {
      /* here we always have i >= 1 */
      a[length - i] = 'Z';
    }
  }
}

void nested_loop_prune_Good(int length) {
  int i, j;
  char a[length];

  for (i = length - 1; i >= 0; i--) {
    for (j = 0; j < i; j++) {
      /* here we always have i >= 1 */
      a[length - i] = 'Z';
    }
  }
}

void bad_if_alias(int* x, int* y) {
  char a[1];
  if (x == y) {
    a[1] = 'A';
  }
}

void call_bad_if_alias_Bad_AlreadyReported() {
  int x;
  bad_if_alias(x, x);
}

void call_bad_if_alias_Good() {
  int x, y;
  bad_if_alias(x, y);
}

void bad_if_not_alias(int* x, int* y) {
  char a[1];
  if (x != y) {
    a[1] = 'B';
  }
}

void call_bad_if_not_alias_Good() {
  int x;
  bad_if_not_alias(x, x);
}

void call_bad_if_not_alias_Bad_AlreadyReported() {
  int x, y;
  bad_if_not_alias(x, y);
}