TheRock/compiler/amd-llvm/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp

// RUN: %clangxx -fsanitize=float-cast-overflow %s -o %t
// RUN: %run %t _
// RUN: %env_ubsan_opts=print_summary=1:report_error_type=1 %run %t 0 2>&1 | FileCheck %s --check-prefix=CHECK-0
// RUN: %run %t 1 2>&1 | FileCheck %s --check-prefix=CHECK-1
// RUN: %run %t 2 2>&1 | FileCheck %s --check-prefix=CHECK-2
// RUN: %run %t 3 2>&1 | FileCheck %s --check-prefix=CHECK-3
// RUN: %run %t 4 2>&1 | FileCheck %s --check-prefix=CHECK-4
// RUN: %run %t 5 2>&1 | FileCheck %s --check-prefix=CHECK-5
// RUN: %run %t 6 2>&1 | FileCheck %s --check-prefix=CHECK-6
// RUN: %run %t 7 2>&1 | FileCheck %s --check-prefix=CHECK-7

// This test assumes float and double are IEEE-754 single- and double-precision.

#if defined(__APPLE__)
#  include <machine/endian.h>
#  define BYTE_ORDER __DARWIN_BYTE_ORDER
#  define BIG_ENDIAN __DARWIN_BIG_ENDIAN
#  define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
#elif defined(__FreeBSD__) || defined(__NetBSD__)
#  include <sys/endian.h>
#  ifndef BYTE_ORDER
#    define BYTE_ORDER _BYTE_ORDER
#  endif
#  ifndef BIG_ENDIAN
#    define BIG_ENDIAN _BIG_ENDIAN
#  endif
#  ifndef LITTLE_ENDIAN
#    define LITTLE_ENDIAN _LITTLE_ENDIAN
#  endif
#elif defined(__sun__) && defined(__svr4__)
// Solaris provides _BIG_ENDIAN/_LITTLE_ENDIAN selector in sys/types.h.
#  include <sys/types.h>
#  define BIG_ENDIAN 4321
#  define LITTLE_ENDIAN 1234
#  if defined(_BIG_ENDIAN)
#    define BYTE_ORDER BIG_ENDIAN
#  else
#    define BYTE_ORDER LITTLE_ENDIAN
#  endif
#elif defined(_WIN32)
#  define BYTE_ORDER 0
#  define BIG_ENDIAN 1
#  define LITTLE_ENDIAN 0
#else
#  include <endian.h>
#  define BYTE_ORDER __BYTE_ORDER
#  define BIG_ENDIAN __BIG_ENDIAN
#  define LITTLE_ENDIAN __LITTLE_ENDIAN
#endif // __APPLE__
#include <stdint.h>
#include <stdio.h>
#include <string.h>

float Inf;
float NaN;

int main(int argc, char **argv) {
  float MaxFloatRepresentableAsInt = 0x7fffff80;
  (int)MaxFloatRepresentableAsInt;  // ok
  (int)-MaxFloatRepresentableAsInt; // ok

  float MinFloatRepresentableAsInt = -0x7fffffff - 1;
  (int)MinFloatRepresentableAsInt; // ok

  float MaxFloatRepresentableAsUInt = 0xffffff00u;
  (unsigned int)MaxFloatRepresentableAsUInt; // ok

#ifdef __SIZEOF_INT128__
  unsigned __int128 FloatMaxAsUInt128 = -((unsigned __int128)1 << 104);
  (void)(float)FloatMaxAsUInt128; // ok
#endif

  float NearlyMinusOne = -0.99999;
  unsigned Zero = NearlyMinusOne; // ok

  // Build a '+Inf'.
#if BYTE_ORDER == LITTLE_ENDIAN
  unsigned char InfVal[] = {0x00, 0x00, 0x80, 0x7f};
#else
  unsigned char InfVal[] = {0x7f, 0x80, 0x00, 0x00};
#endif
  float Inf;
  memcpy(&Inf, InfVal, 4);

  // Build a 'NaN'.
#if BYTE_ORDER == LITTLE_ENDIAN
  unsigned char NaNVal[] = {0x01, 0x00, 0x80, 0x7f};
#else
  unsigned char NaNVal[] = {0x7f, 0x80, 0x00, 0x01};
#endif
  float NaN;
  memcpy(&NaN, NaNVal, 4);

  double DblInf = (double)Inf; // ok

  switch (argv[1][0]) {
    // FIXME: Produce a source location for these checks and test for it here.

    // Floating point -> integer overflow.
  case '0': {
    // Note that values between 0x7ffffe00 and 0x80000000 may or may not
    // successfully round-trip, depending on the rounding mode.
    // CHECK-0: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: 2.14748{{.*}} is outside the range of representable values of type 'int'
    static int test_int = MaxFloatRepresentableAsInt + 0x80;
    // CHECK-0: SUMMARY: {{.*}}Sanitizer: float-cast-overflow {{.*}}cast-overflow.cpp:[[@LINE-1]]
    return 0;
  }
  case '1': {
    // CHECK-1: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: -2.14748{{.*}} is outside the range of representable values of type 'int'
    static int test_int = MinFloatRepresentableAsInt - 0x100;
    return 0;
  }
  case '2': {
    // CHECK-2: {{.*}}cast-overflow.cpp:[[@LINE+2]]:37: runtime error: -1 is outside the range of representable values of type 'unsigned int'
    volatile float f = -1.0;
    volatile unsigned u = (unsigned)f;
    return 0;
  }
  case '3': {
    // CHECK-3: {{.*}}cast-overflow.cpp:[[@LINE+1]]:37: runtime error: 4.2949{{.*}} is outside the range of representable values of type 'unsigned int'
    static int test_int = (unsigned)(MaxFloatRepresentableAsUInt + 0x100);
    return 0;
  }

  case '4': {
    // CHECK-4: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
    static int test_int = Inf;
    return 0;
  }
  case '5': {
    // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
    static int test_int = NaN;
    return 0;
  }
  // Integer -> floating point overflow.
  case '6': {
    // CHECK-6: cast-overflow.cpp:[[@LINE+2]]:{{27: runtime error: 3.40282e\+38 is outside the range of representable values of type 'int'| __int128 not supported}}
#if defined(__SIZEOF_INT128__) && !defined(_WIN32)
    static int test_int = (float)(FloatMaxAsUInt128 + 1);
    return 0;
#else
    // Print the same line as the check above.
    // That way the test is robust to line changes around it
    printf("%s:%d: __int128 not supported", __FILE__, __LINE__ - 5);
    return 0;
#endif
  }
  case '7': {
    volatile long double ld = 300.0;
    // CHECK-7: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: 300 is outside the range of representable values of type 'char'
    char c = ld;
    // `c` is allowed to contain UNDEF, thus we should not use
    // its value as an exit code.
    return 0;
  }
  }
}