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
main(int argc,char ** argv)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 unsigned char InfVal[] = { 0x00, 0x00, 0x80, 0x7f };
65 #else
66 unsigned 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 unsigned char NaNVal[] = { 0x01, 0x00, 0x80, 0x7f };
74 #else
75 unsigned 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