1 // run 2 3 // Copyright 2010 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Test that zero division causes a panic. 8 9 package main 10 11 import ( 12 "fmt" 13 "math" 14 "runtime" 15 "strings" 16 ) 17 18 type ErrorTest struct { 19 name string 20 fn func() 21 err string 22 } 23 24 var ( 25 i, j, k int = 0, 0, 1 26 i8, j8, k8 int8 = 0, 0, 1 27 i16, j16, k16 int16 = 0, 0, 1 28 i32, j32, k32 int32 = 0, 0, 1 29 i64, j64, k64 int64 = 0, 0, 1 30 31 u, v, w uint = 0, 0, 1 32 u8, v8, w8 uint8 = 0, 0, 1 33 u16, v16, w16 uint16 = 0, 0, 1 34 u32, v32, w32 uint32 = 0, 0, 1 35 u64, v64, w64 uint64 = 0, 0, 1 36 up, vp, wp uintptr = 0, 0, 1 37 38 f, g, h float64 = 0, 0, 1 39 f32, g32, h32 float32 = 0, 0, 1 40 f64, g64, h64, inf, negInf, nan float64 = 0, 0, 1, math.Inf(1), math.Inf(-1), math.NaN() 41 42 c, d, e complex128 = 0 + 0i, 0 + 0i, 1 + 1i 43 c64, d64, e64 complex64 = 0 + 0i, 0 + 0i, 1 + 1i 44 c128, d128, e128 complex128 = 0 + 0i, 0 + 0i, 1 + 1i 45 ) 46 47 // Fool gccgo into thinking that these variables can change. 48 func NotCalled() { 49 i++ 50 j++ 51 k++ 52 i8++ 53 j8++ 54 k8++ 55 i16++ 56 j16++ 57 k16++ 58 i32++ 59 j32++ 60 k32++ 61 i64++ 62 j64++ 63 k64++ 64 65 u++ 66 v++ 67 w++ 68 u8++ 69 v8++ 70 w8++ 71 u16++ 72 v16++ 73 w16++ 74 u32++ 75 v32++ 76 w32++ 77 u64++ 78 v64++ 79 w64++ 80 up++ 81 vp++ 82 wp++ 83 84 f += 1 85 g += 1 86 h += 1 87 f32 += 1 88 g32 += 1 89 h32 += 1 90 f64 += 1 91 g64 += 1 92 h64 += 1 93 94 c += 1 + 1i 95 d += 1 + 1i 96 e += 1 + 1i 97 c64 += 1 + 1i 98 d64 += 1 + 1i 99 e64 += 1 + 1i 100 c128 += 1 + 1i 101 d128 += 1 + 1i 102 e128 += 1 + 1i 103 } 104 105 var tmp interface{} 106 107 // We could assign to _ but the compiler optimizes it too easily. 108 func use(v interface{}) { 109 tmp = v 110 } 111 112 // Verify error/no error for all types. 113 var errorTests = []ErrorTest{ 114 // All integer divide by zero should error. 115 ErrorTest{"int 0/0", func() { use(i / j) }, "divide"}, 116 ErrorTest{"int8 0/0", func() { use(i8 / j8) }, "divide"}, 117 ErrorTest{"int16 0/0", func() { use(i16 / j16) }, "divide"}, 118 ErrorTest{"int32 0/0", func() { use(i32 / j32) }, "divide"}, 119 ErrorTest{"int64 0/0", func() { use(i64 / j64) }, "divide"}, 120 121 ErrorTest{"int 1/0", func() { use(k / j) }, "divide"}, 122 ErrorTest{"int8 1/0", func() { use(k8 / j8) }, "divide"}, 123 ErrorTest{"int16 1/0", func() { use(k16 / j16) }, "divide"}, 124 ErrorTest{"int32 1/0", func() { use(k32 / j32) }, "divide"}, 125 ErrorTest{"int64 1/0", func() { use(k64 / j64) }, "divide"}, 126 127 ErrorTest{"uint 0/0", func() { use(u / v) }, "divide"}, 128 ErrorTest{"uint8 0/0", func() { use(u8 / v8) }, "divide"}, 129 ErrorTest{"uint16 0/0", func() { use(u16 / v16) }, "divide"}, 130 ErrorTest{"uint32 0/0", func() { use(u32 / v32) }, "divide"}, 131 ErrorTest{"uint64 0/0", func() { use(u64 / v64) }, "divide"}, 132 ErrorTest{"uintptr 0/0", func() { use(up / vp) }, "divide"}, 133 134 ErrorTest{"uint 1/0", func() { use(w / v) }, "divide"}, 135 ErrorTest{"uint8 1/0", func() { use(w8 / v8) }, "divide"}, 136 ErrorTest{"uint16 1/0", func() { use(w16 / v16) }, "divide"}, 137 ErrorTest{"uint32 1/0", func() { use(w32 / v32) }, "divide"}, 138 ErrorTest{"uint64 1/0", func() { use(w64 / v64) }, "divide"}, 139 ErrorTest{"uintptr 1/0", func() { use(wp / vp) }, "divide"}, 140 141 // All float64ing divide by zero should not error. 142 ErrorTest{"float64 0/0", func() { use(f / g) }, ""}, 143 ErrorTest{"float32 0/0", func() { use(f32 / g32) }, ""}, 144 ErrorTest{"float64 0/0", func() { use(f64 / g64) }, ""}, 145 146 ErrorTest{"float64 1/0", func() { use(h / g) }, ""}, 147 ErrorTest{"float32 1/0", func() { use(h32 / g32) }, ""}, 148 ErrorTest{"float64 1/0", func() { use(h64 / g64) }, ""}, 149 ErrorTest{"float64 inf/0", func() { use(inf / g64) }, ""}, 150 ErrorTest{"float64 -inf/0", func() { use(negInf / g64) }, ""}, 151 ErrorTest{"float64 nan/0", func() { use(nan / g64) }, ""}, 152 153 // All complex divide by zero should not error. 154 ErrorTest{"complex 0/0", func() { use(c / d) }, ""}, 155 ErrorTest{"complex64 0/0", func() { use(c64 / d64) }, ""}, 156 ErrorTest{"complex128 0/0", func() { use(c128 / d128) }, ""}, 157 158 ErrorTest{"complex 1/0", func() { use(e / d) }, ""}, 159 ErrorTest{"complex64 1/0", func() { use(e64 / d64) }, ""}, 160 ErrorTest{"complex128 1/0", func() { use(e128 / d128) }, ""}, 161 } 162 163 func error_(fn func()) (error string) { 164 defer func() { 165 if e := recover(); e != nil { 166 error = e.(runtime.Error).Error() 167 } 168 }() 169 fn() 170 return "" 171 } 172 173 type FloatTest struct { 174 f, g float64 175 out float64 176 } 177 178 var float64Tests = []FloatTest{ 179 FloatTest{0, 0, nan}, 180 FloatTest{nan, 0, nan}, 181 FloatTest{inf, 0, inf}, 182 FloatTest{negInf, 0, negInf}, 183 } 184 185 func alike(a, b float64) bool { 186 switch { 187 case math.IsNaN(a) && math.IsNaN(b): 188 return true 189 case a == b: 190 return math.Signbit(a) == math.Signbit(b) 191 } 192 return false 193 } 194 195 func main() { 196 bad := false 197 for _, t := range errorTests { 198 if t.err != "" { 199 continue 200 } 201 err := error_(t.fn) 202 switch { 203 case t.err == "" && err == "": 204 // fine 205 case t.err != "" && err == "": 206 if !bad { 207 bad = true 208 fmt.Printf("BUG\n") 209 } 210 fmt.Printf("%s: expected %q; got no error\n", t.name, t.err) 211 case t.err == "" && err != "": 212 if !bad { 213 bad = true 214 fmt.Printf("BUG\n") 215 } 216 fmt.Printf("%s: expected no error; got %q\n", t.name, err) 217 case t.err != "" && err != "": 218 if strings.Index(err, t.err) < 0 { 219 if !bad { 220 bad = true 221 fmt.Printf("BUG\n") 222 } 223 fmt.Printf("%s: expected %q; got %q\n", t.name, t.err, err) 224 continue 225 } 226 } 227 } 228 229 // At this point we know we don't error on the values we're testing 230 for _, t := range float64Tests { 231 x := t.f / t.g 232 if !alike(x, t.out) { 233 if !bad { 234 bad = true 235 fmt.Printf("BUG\n") 236 } 237 fmt.Printf("%v/%v: expected %g error; got %g\n", t.f, t.g, t.out, x) 238 } 239 } 240 if bad { 241 panic("zerodivide") 242 } 243 } 244
