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

   1 // RUN: %clangxx -fsanitize=float-cast-overflow %s -o %t
   2 // RUN: %run %t _
   3 // RUN: %env_ubsan_opts=print_summary=1:report_error_type=1 %run %t 0 2>&1 | FileCheck %s --check-prefix=CHECK-0
   4 // RUN: %run %t 1 2>&1 | FileCheck %s --check-prefix=CHECK-1
   5 // RUN: %run %t 2 2>&1 | FileCheck %s --check-prefix=CHECK-2
   6 // RUN: %run %t 3 2>&1 | FileCheck %s --check-prefix=CHECK-3
   7 // RUN: %run %t 4 2>&1 | FileCheck %s --check-prefix=CHECK-4
   8 // RUN: %run %t 5 2>&1 | FileCheck %s --check-prefix=CHECK-5
   9 // RUN: %run %t 6 2>&1 | FileCheck %s --check-prefix=CHECK-6
  10 // FIXME: %run %t 7 2>&1 | FileCheck %s --check-prefix=CHECK-7
  11 // FIXME: not %run %t 8 2>&1 | FileCheck %s --check-prefix=CHECK-8
  12 // RUN: not %run %t 9 2>&1 | FileCheck %s --check-prefix=CHECK-9
  13
  14 // Issue #41838
  15 // XFAIL: sparc-target-arch && target={{.*solaris.*}}
  16
  17 // This test assumes float and double are IEEE-754 single- and double-precision.
  18
  19 #if defined(__APPLE__)
  20 # include <machine/endian.h>
  21 # define BYTE_ORDER __DARWIN_BYTE_ORDER
  22 # define BIG_ENDIAN __DARWIN_BIG_ENDIAN
  23 # define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
  24 #elif defined(__FreeBSD__) || defined(__NetBSD__)
  25 # include <sys/endian.h>
  26 # ifndef BYTE_ORDER
  27 #  define BYTE_ORDER _BYTE_ORDER
  28 # endif
  29 # ifndef BIG_ENDIAN
  30 #  define BIG_ENDIAN _BIG_ENDIAN
  31 # endif
  32 # ifndef LITTLE_ENDIAN
  33 #  define LITTLE_ENDIAN _LITTLE_ENDIAN
  34 # endif
  35 #elif defined(__sun__) && defined(__svr4__)
  36 // Solaris provides _BIG_ENDIAN/_LITTLE_ENDIAN selector in sys/types.h.
  37 # include <sys/types.h>
  38 # define BIG_ENDIAN 4321
  39 # define LITTLE_ENDIAN 1234
  40 # if defined(_BIG_ENDIAN)
  41 #  define BYTE_ORDER BIG_ENDIAN
  42 # else
  43 #  define BYTE_ORDER LITTLE_ENDIAN
  44 # endif
  45 #elif defined(_WIN32)
  46 # define BYTE_ORDER 0
  47 # define BIG_ENDIAN 1
  48 # define LITTLE_ENDIAN 0
  49 #else
  50 # include <endian.h>
  51 # define BYTE_ORDER __BYTE_ORDER
  52 # define BIG_ENDIAN __BIG_ENDIAN
  53 # define LITTLE_ENDIAN __LITTLE_ENDIAN
  54 #endif  // __APPLE__
  55 #include <stdint.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58
  59 float Inf;
  60 float NaN;
  61
  62 int main(int argc, char **argv) {
  63   float MaxFloatRepresentableAsInt = 0x7fffff80;
  64   (int)MaxFloatRepresentableAsInt; // ok
  65   (int)-MaxFloatRepresentableAsInt; // ok
  66
  67   float MinFloatRepresentableAsInt = -0x7fffffff - 1;
  68   (int)MinFloatRepresentableAsInt; // ok
  69
  70   float MaxFloatRepresentableAsUInt = 0xffffff00u;
  71   (unsigned int)MaxFloatRepresentableAsUInt; // ok
  72
  73 #ifdef __SIZEOF_INT128__
  74   unsigned __int128 FloatMaxAsUInt128 = -((unsigned __int128)1 << 104);
  75   (void)(float)FloatMaxAsUInt128; // ok
  76 #endif
  77
  78   float NearlyMinusOne = -0.99999;
  79   unsigned Zero = NearlyMinusOne; // ok
  80
  81   // Build a '+Inf'.
  82 #if BYTE_ORDER == LITTLE_ENDIAN
  83   unsigned char InfVal[] = { 0x00, 0x00, 0x80, 0x7f };
  84 #else
  85   unsigned char InfVal[] = { 0x7f, 0x80, 0x00, 0x00 };
  86 #endif
  87   float Inf;
  88   memcpy(&Inf, InfVal, 4);
  89
  90   // Build a 'NaN'.
  91 #if BYTE_ORDER == LITTLE_ENDIAN
  92   unsigned char NaNVal[] = { 0x01, 0x00, 0x80, 0x7f };
  93 #else
  94   unsigned char NaNVal[] = { 0x7f, 0x80, 0x00, 0x01 };
  95 #endif
  96   float NaN;
  97   memcpy(&NaN, NaNVal, 4);
  98
  99   double DblInf = (double)Inf; // ok
 100
 101   switch (argv[1][0]) {
 102     // FIXME: Produce a source location for these checks and test for it here.
 103
 104     // Floating point -> integer overflow.
 105   case '0': {
 106     // Note that values between 0x7ffffe00 and 0x80000000 may or may not
 107     // successfully round-trip, depending on the rounding mode.
 108     // CHECK-0: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: 2.14748{{.*}} is outside the range of representable values of type 'int'
 109     static int test_int = MaxFloatRepresentableAsInt + 0x80;
 110     // CHECK-0: SUMMARY: {{.*}}Sanitizer: float-cast-overflow {{.*}}cast-overflow.cpp:[[@LINE-1]]
 111     return 0;
 112     }
 113   case '1': {
 114     // CHECK-1: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: -2.14748{{.*}} is outside the range of representable values of type 'int'
 115     static int test_int = MinFloatRepresentableAsInt - 0x100;
 116     return 0;
 117   }
 118   case '2': {
 119     // CHECK-2: {{.*}}cast-overflow.cpp:[[@LINE+2]]:37: runtime error: -1 is outside the range of representable values of type 'unsigned int'
 120     volatile float f = -1.0;
 121     volatile unsigned u = (unsigned)f;
 122     return 0;
 123   }
 124   case '3': {
 125     // CHECK-3: {{.*}}cast-overflow.cpp:[[@LINE+1]]:37: runtime error: 4.2949{{.*}} is outside the range of representable values of type 'unsigned int'
 126     static int test_int = (unsigned)(MaxFloatRepresentableAsUInt + 0x100);
 127     return 0;
 128   }
 129
 130   case '4': {
 131     // CHECK-4: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
 132     static int test_int = Inf;
 133     return 0;
 134   }
 135   case '5': {
 136     // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: {{.*}} is outside the range of representable values of type 'int'
 137     static int test_int = NaN;
 138     return 0;
 139   }
 140
 141     // Integer -> floating point overflow.
 142   case '6': {
 143     // 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}}
 144 #if defined(__SIZEOF_INT128__) && !defined(_WIN32)
 145     static int test_int = (float)(FloatMaxAsUInt128 + 1);
 146     return 0;
 147 #else
 148     // Print the same line as the check above. That way the test is robust to
 149     // line changes around it
 150     printf("%s:%d: __int128 not supported", __FILE__, __LINE__ - 5);
 151     return 0;
 152 #endif
 153   }
 154   // FIXME: The backend cannot lower __fp16 operations on x86 yet.
 155   //case '7':
 156   //  (__fp16)65504; // ok
 157   //  // CHECK-7: runtime error: 65505 is outside the range of representable values of type '__fp16'
 158   //  return (__fp16)65505;
 159
 160     // Floating point -> floating point overflow.
 161   case '8':
 162     // CHECK-8: {{.*}}cast-overflow.cpp:[[@LINE+1]]:19: runtime error: 1e+39 is outside the range of representable values of type 'float'
 163     return (float)1e39;
 164   case '9':
 165     volatile long double ld = 300.0;
 166     // CHECK-9: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: 300 is outside the range of representable values of type 'char'
 167     char c = ld;
 168     return c;
 169   }
 170 }