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 // 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 #elif defined(_WIN32) 27 # define BYTE_ORDER 0 28 # define BIG_ENDIAN 1 29 # define LITTLE_ENDIAN 0 30 #else 31 # include <endian.h> 32 # define BYTE_ORDER __BYTE_ORDER 33 # define BIG_ENDIAN __BIG_ENDIAN 34 # define LITTLE_ENDIAN __LITTLE_ENDIAN 35 #endif // __APPLE__ 36 #include <stdint.h> 37 #include <stdio.h> 38 #include <string.h> 39 40 float Inf; 41 float NaN; 42 43 int main(int argc, char **argv) { 44 float MaxFloatRepresentableAsInt = 0x7fffff80; 45 (int)MaxFloatRepresentableAsInt; // ok 46 (int)-MaxFloatRepresentableAsInt; // ok 47 48 float MinFloatRepresentableAsInt = -0x7fffffff - 1; 49 (int)MinFloatRepresentableAsInt; // ok 50 51 float MaxFloatRepresentableAsUInt = 0xffffff00u; 52 (unsigned int)MaxFloatRepresentableAsUInt; // ok 53 54 #ifdef __SIZEOF_INT128__ 55 unsigned __int128 FloatMaxAsUInt128 = -((unsigned __int128)1 << 104); 56 (void)(float)FloatMaxAsUInt128; // ok 57 #endif 58 59 float NearlyMinusOne = -0.99999; 60 unsigned Zero = NearlyMinusOne; // ok 61 62 // Build a '+Inf'. 63 #if BYTE_ORDER == LITTLE_ENDIAN 64 char InfVal[] = { 0x00, 0x00, 0x80, 0x7f }; 65 #else 66 char InfVal[] = { 0x7f, 0x80, 0x00, 0x00 }; 67 #endif 68 float Inf; 69 memcpy(&Inf, InfVal, 4); 70 71 // Build a 'NaN'. 72 #if BYTE_ORDER == LITTLE_ENDIAN 73 char NaNVal[] = { 0x01, 0x00, 0x80, 0x7f }; 74 #else 75 char NaNVal[] = { 0x7f, 0x80, 0x00, 0x01 }; 76 #endif 77 float NaN; 78 memcpy(&NaN, NaNVal, 4); 79 80 double DblInf = (double)Inf; // ok 81 82 switch (argv[1][0]) { 83 // FIXME: Produce a source location for these checks and test for it here. 84 85 // Floating point -> integer overflow. 86 case '0': { 87 // Note that values between 0x7ffffe00 and 0x80000000 may or may not 88 // successfully round-trip, depending on the rounding mode. 89 // CHECK-0: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value 2.14748{{.*}} is outside the range of representable values of type 'int' 90 static int test_int = MaxFloatRepresentableAsInt + 0x80; 91 // CHECK-0: SUMMARY: {{.*}}Sanitizer: float-cast-overflow {{.*}}cast-overflow.cpp:[[@LINE-1]] 92 return 0; 93 } 94 case '1': { 95 // CHECK-1: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value -2.14748{{.*}} is outside the range of representable values of type 'int' 96 static int test_int = MinFloatRepresentableAsInt - 0x100; 97 return 0; 98 } 99 case '2': { 100 // CHECK-2: {{.*}}cast-overflow.cpp:[[@LINE+2]]:37: runtime error: value -1 is outside the range of representable values of type 'unsigned int' 101 volatile float f = -1.0; 102 volatile unsigned u = (unsigned)f; 103 return 0; 104 } 105 case '3': { 106 // CHECK-3: {{.*}}cast-overflow.cpp:[[@LINE+1]]:37: runtime error: value 4.2949{{.*}} is outside the range of representable values of type 'unsigned int' 107 static int test_int = (unsigned)(MaxFloatRepresentableAsUInt + 0x100); 108 return 0; 109 } 110 111 case '4': { 112 // CHECK-4: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value {{.*}} is outside the range of representable values of type 'int' 113 static int test_int = Inf; 114 return 0; 115 } 116 case '5': { 117 // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value {{.*}} is outside the range of representable values of type 'int' 118 static int test_int = NaN; 119 return 0; 120 } 121 122 // Integer -> floating point overflow. 123 case '6': { 124 // CHECK-6: cast-overflow.cpp:[[@LINE+2]]:{{34: runtime error: value 0xffffff00000000000000000000000001 is outside the range of representable values of type 'float'| __int128 not supported}} 125 #if defined(__SIZEOF_INT128__) && !defined(_WIN32) 126 static int test_int = (float)(FloatMaxAsUInt128 + 1); 127 return 0; 128 #else 129 // Print the same line as the check above. That way the test is robust to 130 // line changes around it 131 printf("%s:%d: __int128 not supported", __FILE__, __LINE__ - 5); 132 return 0; 133 #endif 134 } 135 // FIXME: The backend cannot lower __fp16 operations on x86 yet. 136 //case '7': 137 // (__fp16)65504; // ok 138 // // CHECK-7: runtime error: value 65505 is outside the range of representable values of type '__fp16' 139 // return (__fp16)65505; 140 141 // Floating point -> floating point overflow. 142 case '8': 143 // CHECK-8: {{.*}}cast-overflow.cpp:[[@LINE+1]]:19: runtime error: value 1e+39 is outside the range of representable values of type 'float' 144 return (float)1e39; 145 case '9': 146 volatile long double ld = 300.0; 147 // CHECK-9: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: value 300 is outside the range of representable values of type 'char' 148 char c = ld; 149 return c; 150 } 151 } 152
