1 // RUN: %clangxx -fsanitize=float-cast-overflow -g %s -o %t 2 // RUN: %run %t _ 3 // RUN: env UBSAN_OPTIONS=print_summary=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 // This test assumes float and double are IEEE-754 single- and double-precision. 15 16 #if defined(__APPLE__) 17 # include <machine/endian.h> 18 # define BYTE_ORDER __DARWIN_BYTE_ORDER 19 # define BIG_ENDIAN __DARWIN_BIG_ENDIAN 20 # define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN 21 #elif defined(__FreeBSD__) 22 # include <sys/endian.h> 23 # define BYTE_ORDER _BYTE_ORDER 24 # define BIG_ENDIAN _BIG_ENDIAN 25 # define LITTLE_ENDIAN _LITTLE_ENDIAN 26 #else 27 # include <endian.h> 28 # define BYTE_ORDER __BYTE_ORDER 29 # define BIG_ENDIAN __BIG_ENDIAN 30 # define LITTLE_ENDIAN __LITTLE_ENDIAN 31 #endif // __APPLE__ 32 #include <stdint.h> 33 #include <stdio.h> 34 #include <string.h> 35 36 float Inf; 37 float NaN; 38 39 int main(int argc, char **argv) { 40 float MaxFloatRepresentableAsInt = 0x7fffff80; 41 (int)MaxFloatRepresentableAsInt; // ok 42 (int)-MaxFloatRepresentableAsInt; // ok 43 44 float MinFloatRepresentableAsInt = -0x7fffffff - 1; 45 (int)MinFloatRepresentableAsInt; // ok 46 47 float MaxFloatRepresentableAsUInt = 0xffffff00u; 48 (unsigned int)MaxFloatRepresentableAsUInt; // ok 49 50 #ifdef __SIZEOF_INT128__ 51 unsigned __int128 FloatMaxAsUInt128 = -((unsigned __int128)1 << 104); 52 (void)(float)FloatMaxAsUInt128; // ok 53 #endif 54 55 float NearlyMinusOne = -0.99999; 56 unsigned Zero = NearlyMinusOne; // ok 57 58 // Build a '+Inf'. 59 #if BYTE_ORDER == LITTLE_ENDIAN 60 char InfVal[] = { 0x00, 0x00, 0x80, 0x7f }; 61 #else 62 char InfVal[] = { 0x7f, 0x80, 0x00, 0x00 }; 63 #endif 64 float Inf; 65 memcpy(&Inf, InfVal, 4); 66 67 // Build a 'NaN'. 68 #if BYTE_ORDER == LITTLE_ENDIAN 69 char NaNVal[] = { 0x01, 0x00, 0x80, 0x7f }; 70 #else 71 char NaNVal[] = { 0x7f, 0x80, 0x00, 0x01 }; 72 #endif 73 float NaN; 74 memcpy(&NaN, NaNVal, 4); 75 76 double DblInf = (double)Inf; // ok 77 78 switch (argv[1][0]) { 79 // FIXME: Produce a source location for these checks and test for it here. 80 81 // Floating point -> integer overflow. 82 case '0': { 83 // Note that values between 0x7ffffe00 and 0x80000000 may or may not 84 // successfully round-trip, depending on the rounding mode. 85 // CHECK-0: runtime error: value 2.14748{{.*}} is outside the range of representable values of type 'int' 86 static int test_int = MaxFloatRepresentableAsInt + 0x80; 87 // CHECK-0: SUMMARY: {{.*}}Sanitizer: undefined-behavior {{.*}}cast-overflow.cpp:[[@LINE-1]] 88 return 0; 89 } 90 case '1': { 91 // CHECK-1: runtime error: value -2.14748{{.*}} is outside the range of representable values of type 'int' 92 static int test_int = MinFloatRepresentableAsInt - 0x100; 93 return 0; 94 } 95 case '2': { 96 // CHECK-2: runtime error: value -1 is outside the range of representable values of type 'unsigned int' 97 volatile float f = -1.0; 98 volatile unsigned u = (unsigned)f; 99 return 0; 100 } 101 case '3': { 102 // CHECK-3: runtime error: value 4.2949{{.*}} is outside the range of representable values of type 'unsigned int' 103 static int test_int = (unsigned)(MaxFloatRepresentableAsUInt + 0x100); 104 return 0; 105 } 106 107 case '4': { 108 // CHECK-4: runtime error: value {{.*}} is outside the range of representable values of type 'int' 109 static int test_int = Inf; 110 return 0; 111 } 112 case '5': { 113 // CHECK-5: runtime error: value {{.*}} is outside the range of representable values of type 'int' 114 static int test_int = NaN; 115 return 0; 116 } 117 118 // Integer -> floating point overflow. 119 case '6': { 120 // CHECK-6: {{runtime error: value 0xffffff00000000000000000000000001 is outside the range of representable values of type 'float'|__int128 not supported}} 121 #ifdef __SIZEOF_INT128__ 122 static int test_int = (float)(FloatMaxAsUInt128 + 1); 123 return 0; 124 #else 125 puts("__int128 not supported"); 126 return 0; 127 #endif 128 } 129 // FIXME: The backend cannot lower __fp16 operations on x86 yet. 130 //case '7': 131 // (__fp16)65504; // ok 132 // // CHECK-7: runtime error: value 65505 is outside the range of representable values of type '__fp16' 133 // return (__fp16)65505; 134 135 // Floating point -> floating point overflow. 136 case '8': 137 // CHECK-8: runtime error: value 1e+39 is outside the range of representable values of type 'float' 138 return (float)1e39; 139 case '9': 140 volatile long double ld = 300.0; 141 // CHECK-9: runtime error: value 300 is outside the range of representable values of type 'char' 142 char c = ld; 143 return c; 144 } 145 } 146