gcc/testsuite/go.test/test/cmp.go

   1 // run
   2
   3 // Copyright 2009 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 equality and inequality operations.
   8
   9 package main
  10
  11 import (
  12         "os"
  13         "unsafe"
  14 )
  15
  16 var global bool
  17
  18 func use(b bool) { global = b }
  19
  20 func stringptr(s string) uintptr { return *(*uintptr)(unsafe.Pointer(&s)) }
  21
  22 func isfalse(b bool) {
  23         if b {
  24                 // stack will explain where
  25                 panic("wanted false, got true")
  26         }
  27 }
  28
  29 func istrue(b bool) {
  30         if !b {
  31                 // stack will explain where
  32                 panic("wanted true, got false")
  33         }
  34 }
  35
  36 type T *int
  37
  38 func main() {
  39         var a []int
  40         var b map[string]int
  41
  42         var c string = "hello"
  43         var d string = "hel" // try to get different pointer
  44         d = d + "lo"
  45
  46         // exp/ssa/interp can't handle unsafe.Pointer.
  47         if os.Getenv("GOSSAINTERP") != "" {
  48                 if stringptr(c) == stringptr(d) {
  49                         panic("compiler too smart -- got same string")
  50                 }
  51         }
  52
  53         var e = make(chan int)
  54
  55         var ia interface{} = a
  56         var ib interface{} = b
  57         var ic interface{} = c
  58         var id interface{} = d
  59         var ie interface{} = e
  60
  61         // these comparisons are okay because
  62         // string compare is okay and the others
  63         // are comparisons where the types differ.
  64         isfalse(ia == ib)
  65         isfalse(ia == ic)
  66         isfalse(ia == id)
  67         isfalse(ib == ic)
  68         isfalse(ib == id)
  69         istrue(ic == id)
  70         istrue(ie == ie)
  71
  72         istrue(ia != ib)
  73         istrue(ia != ic)
  74         istrue(ia != id)
  75         istrue(ib != ic)
  76         istrue(ib != id)
  77         isfalse(ic != id)
  78         isfalse(ie != ie)
  79
  80         // these are not okay, because there is no comparison on slices or maps.
  81         //isfalse(a == ib)
  82         //isfalse(a == ic)
  83         //isfalse(a == id)
  84         //isfalse(b == ic)
  85         //isfalse(b == id)
  86
  87         istrue(c == id)
  88         istrue(e == ie)
  89
  90         //isfalse(ia == b)
  91         isfalse(ia == c)
  92         isfalse(ia == d)
  93         isfalse(ib == c)
  94         isfalse(ib == d)
  95         istrue(ic == d)
  96         istrue(ie == e)
  97
  98         //istrue(a != ib)
  99         //istrue(a != ic)
 100         //istrue(a != id)
 101         //istrue(b != ic)
 102         //istrue(b != id)
 103         isfalse(c != id)
 104         isfalse(e != ie)
 105
 106         //istrue(ia != b)
 107         istrue(ia != c)
 108         istrue(ia != d)
 109         istrue(ib != c)
 110         istrue(ib != d)
 111         isfalse(ic != d)
 112         isfalse(ie != e)
 113
 114         // 6g used to let this go through as true.
 115         var g uint64 = 123
 116         var h int64 = 123
 117         var ig interface{} = g
 118         var ih interface{} = h
 119         isfalse(ig == ih)
 120         istrue(ig != ih)
 121
 122         // map of interface should use == on interface values,
 123         // not memory.
 124         var m = make(map[interface{}]int)
 125         m[ic] = 1
 126         m[id] = 2
 127         if m[c] != 2 {
 128                 println("m[c] = ", m[c])
 129                 panic("bad m[c]")
 130         }
 131
 132         // non-interface comparisons
 133         {
 134                 c := make(chan int)
 135                 c1 := (<-chan int)(c)
 136                 c2 := (chan<- int)(c)
 137                 istrue(c == c1)
 138                 istrue(c == c2)
 139                 istrue(c1 == c)
 140                 istrue(c2 == c)
 141
 142                 isfalse(c != c1)
 143                 isfalse(c != c2)
 144                 isfalse(c1 != c)
 145                 isfalse(c2 != c)
 146
 147                 d := make(chan int)
 148                 isfalse(c == d)
 149                 isfalse(d == c)
 150                 isfalse(d == c1)
 151                 isfalse(d == c2)
 152                 isfalse(c1 == d)
 153                 isfalse(c2 == d)
 154
 155                 istrue(c != d)
 156                 istrue(d != c)
 157                 istrue(d != c1)
 158                 istrue(d != c2)
 159                 istrue(c1 != d)
 160                 istrue(c2 != d)
 161         }
 162
 163         // named types vs not
 164         {
 165                 var x = new(int)
 166                 var y T
 167                 var z T = x
 168
 169                 isfalse(x == y)
 170                 istrue(x == z)
 171                 isfalse(y == z)
 172
 173                 isfalse(y == x)
 174                 istrue(z == x)
 175                 isfalse(z == y)
 176
 177                 istrue(x != y)
 178                 isfalse(x != z)
 179                 istrue(y != z)
 180
 181                 istrue(y != x)
 182                 isfalse(z != x)
 183                 istrue(z != y)
 184         }
 185
 186         // structs
 187         {
 188                 var x = struct {
 189                         x int
 190                         y string
 191                 }{1, "hi"}
 192                 var y = struct {
 193                         x int
 194                         y string
 195                 }{2, "bye"}
 196                 var z = struct {
 197                         x int
 198                         y string
 199                 }{1, "hi"}
 200
 201                 isfalse(x == y)
 202                 isfalse(y == x)
 203                 isfalse(y == z)
 204                 isfalse(z == y)
 205                 istrue(x == z)
 206                 istrue(z == x)
 207
 208                 istrue(x != y)
 209                 istrue(y != x)
 210                 istrue(y != z)
 211                 istrue(z != y)
 212                 isfalse(x != z)
 213                 isfalse(z != x)
 214
 215                 var m = make(map[struct {
 216                         x int
 217                         y string
 218                 }]int)
 219                 m[x] = 10
 220                 m[y] = 20
 221                 m[z] = 30
 222                 istrue(m[x] == 30)
 223                 istrue(m[y] == 20)
 224                 istrue(m[z] == 30)
 225                 istrue(m[x] != 10)
 226                 isfalse(m[x] != 30)
 227                 isfalse(m[y] != 20)
 228                 isfalse(m[z] != 30)
 229                 isfalse(m[x] == 10)
 230
 231                 var m1 = make(map[struct {
 232                         x int
 233                         y string
 234                 }]struct {
 235                         x int
 236                         y string
 237                 })
 238                 m1[x] = x
 239                 m1[y] = y
 240                 m1[z] = z
 241                 istrue(m1[x] == z)
 242                 istrue(m1[y] == y)
 243                 istrue(m1[z] == z)
 244                 istrue(m1[x] == x)
 245                 isfalse(m1[x] != z)
 246                 isfalse(m1[y] != y)
 247                 isfalse(m1[z] != z)
 248                 isfalse(m1[x] != x)
 249
 250                 var ix, iy, iz interface{} = x, y, z
 251
 252                 isfalse(ix == iy)
 253                 isfalse(iy == ix)
 254                 isfalse(iy == iz)
 255                 isfalse(iz == iy)
 256                 istrue(ix == iz)
 257                 istrue(iz == ix)
 258
 259                 isfalse(x == iy)
 260                 isfalse(y == ix)
 261                 isfalse(y == iz)
 262                 isfalse(z == iy)
 263                 istrue(x == iz)
 264                 istrue(z == ix)
 265
 266                 isfalse(ix == y)
 267                 isfalse(iy == x)
 268                 isfalse(iy == z)
 269                 isfalse(iz == y)
 270                 istrue(ix == z)
 271                 istrue(iz == x)
 272
 273                 istrue(ix != iy)
 274                 istrue(iy != ix)
 275                 istrue(iy != iz)
 276                 istrue(iz != iy)
 277                 isfalse(ix != iz)
 278                 isfalse(iz != ix)
 279
 280                 istrue(x != iy)
 281                 istrue(y != ix)
 282                 istrue(y != iz)
 283                 istrue(z != iy)
 284                 isfalse(x != iz)
 285                 isfalse(z != ix)
 286
 287                 istrue(ix != y)
 288                 istrue(iy != x)
 289                 istrue(iy != z)
 290                 istrue(iz != y)
 291                 isfalse(ix != z)
 292                 isfalse(iz != x)
 293         }
 294
 295         // structs with _ fields
 296         {
 297                 var x = struct {
 298                         x int
 299                         _ []int
 300                         y float64
 301                         _ float64
 302                         z int
 303                 }{
 304                         x: 1, y: 2, z: 3,
 305                 }
 306                 var ix interface{} = x
 307
 308                 istrue(x == x)
 309                 istrue(x == ix)
 310                 istrue(ix == x)
 311                 istrue(ix == ix)
 312         }
 313
 314         // arrays
 315         {
 316                 var x = [2]string{"1", "hi"}
 317                 var y = [2]string{"2", "bye"}
 318                 var z = [2]string{"1", "hi"}
 319
 320                 isfalse(x == y)
 321                 isfalse(y == x)
 322                 isfalse(y == z)
 323                 isfalse(z == y)
 324                 istrue(x == z)
 325                 istrue(z == x)
 326
 327                 istrue(x != y)
 328                 istrue(y != x)
 329                 istrue(y != z)
 330                 istrue(z != y)
 331                 isfalse(x != z)
 332                 isfalse(z != x)
 333
 334                 var m = make(map[[2]string]int)
 335                 m[x] = 10
 336                 m[y] = 20
 337                 m[z] = 30
 338                 istrue(m[x] == 30)
 339                 istrue(m[y] == 20)
 340                 istrue(m[z] == 30)
 341                 isfalse(m[x] != 30)
 342                 isfalse(m[y] != 20)
 343                 isfalse(m[z] != 30)
 344
 345                 var ix, iy, iz interface{} = x, y, z
 346
 347                 isfalse(ix == iy)
 348                 isfalse(iy == ix)
 349                 isfalse(iy == iz)
 350                 isfalse(iz == iy)
 351                 istrue(ix == iz)
 352                 istrue(iz == ix)
 353
 354                 isfalse(x == iy)
 355                 isfalse(y == ix)
 356                 isfalse(y == iz)
 357                 isfalse(z == iy)
 358                 istrue(x == iz)
 359                 istrue(z == ix)
 360
 361                 isfalse(ix == y)
 362                 isfalse(iy == x)
 363                 isfalse(iy == z)
 364                 isfalse(iz == y)
 365                 istrue(ix == z)
 366                 istrue(iz == x)
 367
 368                 istrue(ix != iy)
 369                 istrue(iy != ix)
 370                 istrue(iy != iz)
 371                 istrue(iz != iy)
 372                 isfalse(ix != iz)
 373                 isfalse(iz != ix)
 374
 375                 istrue(x != iy)
 376                 istrue(y != ix)
 377                 istrue(y != iz)
 378                 istrue(z != iy)
 379                 isfalse(x != iz)
 380                 isfalse(z != ix)
 381
 382                 istrue(ix != y)
 383                 istrue(iy != x)
 384                 istrue(iy != z)
 385                 istrue(iz != y)
 386                 isfalse(ix != z)
 387                 isfalse(iz != x)
 388         }
 389
 390         shouldPanic(p1)
 391         shouldPanic(p2)
 392         shouldPanic(p3)
 393         shouldPanic(p4)
 394 }
 395
 396 func p1() {
 397         var a []int
 398         var ia interface{} = a
 399         use(ia == ia)
 400 }
 401
 402 func p2() {
 403         var b []int
 404         var ib interface{} = b
 405         use(ib == ib)
 406 }
 407
 408 func p3() {
 409         var a []int
 410         var ia interface{} = a
 411         var m = make(map[interface{}]int)
 412         m[ia] = 1
 413 }
 414
 415 func p4() {
 416         var b []int
 417         var ib interface{} = b
 418         var m = make(map[interface{}]int)
 419         m[ib] = 1
 420 }
 421
 422 func shouldPanic(f func()) {
 423         defer func() {
 424                 if recover() == nil {
 425                         panic("function should panic")
 426                 }
 427         }()
 428         f()
 429 }