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 // FIXME: http://llvm.org/PR26919 15 // XFAIL: win32 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__) 25 # include <sys/endian.h> 26 # define BYTE_ORDER _BYTE_ORDER 27 # define BIG_ENDIAN _BIG_ENDIAN 28 # define LITTLE_ENDIAN _LITTLE_ENDIAN 29 #elif defined(_WIN32) 30 # define BYTE_ORDER 0 31 # define BIG_ENDIAN 1 32 # define LITTLE_ENDIAN 0 33 #else 34 # include <endian.h> 35 # define BYTE_ORDER __BYTE_ORDER 36 # define BIG_ENDIAN __BIG_ENDIAN 37 # define LITTLE_ENDIAN __LITTLE_ENDIAN 38 #endif // __APPLE__ 39 #include <stdint.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 float Inf; 44 float NaN; 45 46 int main(int argc, char **argv) { 47 float MaxFloatRepresentableAsInt = 0x7fffff80; 48 (int)MaxFloatRepresentableAsInt; // ok 49 (int)-MaxFloatRepresentableAsInt; // ok 50 51 float MinFloatRepresentableAsInt = -0x7fffffff - 1; 52 (int)MinFloatRepresentableAsInt; // ok 53 54 float MaxFloatRepresentableAsUInt = 0xffffff00u; 55 (unsigned int)MaxFloatRepresentableAsUInt; // ok 56 57 #ifdef __SIZEOF_INT128__ 58 unsigned __int128 FloatMaxAsUInt128 = -((unsigned __int128)1 << 104); 59 (void)(float)FloatMaxAsUInt128; // ok 60 #endif 61 62 float NearlyMinusOne = -0.99999; 63 unsigned Zero = NearlyMinusOne; // ok 64 65 // Build a '+Inf'. 66 #if BYTE_ORDER == LITTLE_ENDIAN 67 unsigned char InfVal[] = { 0x00, 0x00, 0x80, 0x7f }; 68 #else 69 unsigned char InfVal[] = { 0x7f, 0x80, 0x00, 0x00 }; 70 #endif 71 float Inf; 72 memcpy(&Inf, InfVal, 4); 73 74 // Build a 'NaN'. 75 #if BYTE_ORDER == LITTLE_ENDIAN 76 unsigned char NaNVal[] = { 0x01, 0x00, 0x80, 0x7f }; 77 #else 78 unsigned char NaNVal[] = { 0x7f, 0x80, 0x00, 0x01 }; 79 #endif 80 float NaN; 81 memcpy(&NaN, NaNVal, 4); 82 83 double DblInf = (double)Inf; // ok 84 85 switch (argv[1][0]) { 86 // FIXME: Produce a source location for these checks and test for it here. 87 88 // Floating point -> integer overflow. 89 case '0': { 90 // Note that values between 0x7ffffe00 and 0x80000000 may or may not 91 // successfully round-trip, depending on the rounding mode. 92 // CHECK-0: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value 2.14748{{.*}} is outside the range of representable values of type 'int' 93 static int test_int = MaxFloatRepresentableAsInt + 0x80; 94 // CHECK-0: SUMMARY: {{.*}}Sanitizer: float-cast-overflow {{.*}}cast-overflow.cpp:[[@LINE-1]] 95 return 0; 96 } 97 case '1': { 98 // CHECK-1: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value -2.14748{{.*}} is outside the range of representable values of type 'int' 99 static int test_int = MinFloatRepresentableAsInt - 0x100; 100 return 0; 101 } 102 case '2': { 103 // CHECK-2: {{.*}}cast-overflow.cpp:[[@LINE+2]]:37: runtime error: value -1 is outside the range of representable values of type 'unsigned int' 104 volatile float f = -1.0; 105 volatile unsigned u = (unsigned)f; 106 return 0; 107 } 108 case '3': { 109 // CHECK-3: {{.*}}cast-overflow.cpp:[[@LINE+1]]:37: runtime error: value 4.2949{{.*}} is outside the range of representable values of type 'unsigned int' 110 static int test_int = (unsigned)(MaxFloatRepresentableAsUInt + 0x100); 111 return 0; 112 } 113 114 case '4': { 115 // CHECK-4: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value {{.*}} is outside the range of representable values of type 'int' 116 static int test_int = Inf; 117 return 0; 118 } 119 case '5': { 120 // CHECK-5: {{.*}}cast-overflow.cpp:[[@LINE+1]]:27: runtime error: value {{.*}} is outside the range of representable values of type 'int' 121 static int test_int = NaN; 122 return 0; 123 } 124 125 // Integer -> floating point overflow. 126 case '6': { 127 // 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}} 128 #if defined(__SIZEOF_INT128__) && !defined(_WIN32) 129 static int test_int = (float)(FloatMaxAsUInt128 + 1); 130 return 0; 131 #else 132 // Print the same line as the check above. That way the test is robust to 133 // line changes around it 134 printf("%s:%d: __int128 not supported", __FILE__, __LINE__ - 5); 135 return 0; 136 #endif 137 } 138 // FIXME: The backend cannot lower __fp16 operations on x86 yet. 139 //case '7': 140 // (__fp16)65504; // ok 141 // // CHECK-7: runtime error: value 65505 is outside the range of representable values of type '__fp16' 142 // return (__fp16)65505; 143 144 // Floating point -> floating point overflow. 145 case '8': 146 // CHECK-8: {{.*}}cast-overflow.cpp:[[@LINE+1]]:19: runtime error: value 1e+39 is outside the range of representable values of type 'float' 147 return (float)1e39; 148 case '9': 149 volatile long double ld = 300.0; 150 // CHECK-9: {{.*}}cast-overflow.cpp:[[@LINE+1]]:14: runtime error: value 300 is outside the range of representable values of type 'char' 151 char c = ld; 152 return c; 153 } 154 } 155