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

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