test/ubsan/TestCases/Pointer/nullptr-and-nonzero-offset-variable.cpp

// R1UN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
// R1UN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
// R1UN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C
// R1UN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB-C

// RUN: %clang -x c++ -fsanitize=pointer-overflow -O0 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O1 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O2 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O3 %s -o %t && %run %t 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK

// RUN: %clang -x c   -fsanitize=pointer-overflow -O0 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c   -fsanitize=pointer-overflow -O1 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c   -fsanitize=pointer-overflow -O2 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c   -fsanitize=pointer-overflow -O3 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB

// RUN: %clang -x c++ -fsanitize=pointer-overflow -O0 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O1 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O2 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB
// RUN: %clang -x c++ -fsanitize=pointer-overflow -O3 %s -o %t && %run %t I_AM_UB 2>&1 | FileCheck %s --implicit-check-not="error:" --check-prefix=CHECK-UB

#include <stdint.h>
#include <stdio.h>

// Just so deduplication doesn't do anything.
static char *getelementpointer_inbounds_v0(char *base, unsigned long offset) {
  // Potentially UB.
  return base + offset;
}
static char *getelementpointer_inbounds_v1(char *base, unsigned long offset) {
  // Potentially UB.
  return base + offset;
}

int main(int argc, char *argv[]) {
  char *base;
  unsigned long offset;

  printf("Dummy\n");
  // CHECK: Dummy

  base = (char *)0;
  offset = argc - 1;
  (void)getelementpointer_inbounds_v0(base, offset);
  // CHECK-UB: {{.*}}.cpp:[[@LINE-17]]:15: runtime error: applying non-zero offset 1 to null pointer
  // CHECK-UB-C: {{.*}}.cpp:[[@LINE-17]]:15: runtime error: applying offset to null pointer

  base = (char *)(intptr_t)(argc - 1);
  offset = argc == 1 ? 0 : -(argc - 1);
  (void)getelementpointer_inbounds_v1(base, offset);
  // CHECK-UB: {{.*}}.cpp:[[@LINE-19]]:15: runtime error: applying non-zero offset to non-null pointer 0x{{.*}} produced null pointer
  // CHECK-UB-C: {{.*}}.cpp:[[@LINE-20]]:15: runtime error: applying offset to null pointer

  return 0;
}