Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | |
| 6 | (function TestClass() { |
| 7 | 'use strict'; |
| 8 | |
| 9 | var calls = 0; |
| 10 | class Base { |
| 11 | constructor(_) { |
| 12 | assertEquals(Base, new.target); |
| 13 | calls++; |
| 14 | } |
| 15 | } |
| 16 | assertInstanceof(new Base(1), Base); |
| 17 | assertInstanceof(new Base(1, 2), Base); |
| 18 | assertInstanceof(new Base(), Base); |
| 19 | assertEquals(3, calls); |
| 20 | })(); |
| 21 | |
| 22 | |
| 23 | (function TestDerivedClass() { |
| 24 | 'use strict'; |
| 25 | |
| 26 | var calls = 0; |
| 27 | class Base { |
| 28 | constructor(expected) { |
| 29 | assertEquals(expected, new.target); |
| 30 | } |
| 31 | } |
| 32 | class Derived extends Base { |
| 33 | constructor(expected) { |
| 34 | super(expected); |
| 35 | assertEquals(expected, new.target); |
| 36 | calls++; |
| 37 | } |
| 38 | } |
| 39 | new Derived(Derived, 'extra'); |
| 40 | new Derived(Derived); |
| 41 | assertEquals(2, calls); |
| 42 | |
| 43 | class Derived2 extends Derived {} |
| 44 | calls = 0; |
| 45 | new Derived2(Derived2); |
| 46 | new Derived2(Derived2, 'extra'); |
| 47 | assertEquals(2, calls); |
| 48 | })(); |
| 49 | |
| 50 | |
| 51 | (function TestFunctionCall() { |
| 52 | var calls; |
| 53 | function f(expected) { |
| 54 | calls++; |
| 55 | assertEquals(expected, new.target); |
| 56 | } |
| 57 | |
| 58 | calls = 0; |
| 59 | f(undefined); |
| 60 | f(undefined, 'extra'); |
| 61 | f(); |
| 62 | assertEquals(3, calls); |
| 63 | |
| 64 | calls = 0; |
| 65 | f.call({}, undefined); |
| 66 | f.call({}, undefined, 'extra'); |
| 67 | f.call({}); |
| 68 | assertEquals(3, calls); |
| 69 | |
| 70 | calls = 0; |
| 71 | f.apply({}, [undefined]); |
| 72 | f.apply({}, [undefined, 'extra']); |
| 73 | f.apply({}, []); |
| 74 | assertEquals(3, calls); |
| 75 | })(); |
| 76 | |
| 77 | |
| 78 | (function TestFunctionConstruct() { |
| 79 | var calls; |
| 80 | function f(expected) { |
| 81 | calls++; |
| 82 | assertEquals(expected, new.target); |
| 83 | } |
| 84 | |
| 85 | calls = 0; |
| 86 | new f(f); |
| 87 | new f(f, 'extra'); |
| 88 | assertEquals(2, calls); |
| 89 | })(); |
| 90 | |
| 91 | |
| 92 | (function TestClassExtendsFunction() { |
| 93 | 'use strict'; |
| 94 | |
| 95 | var calls = 0; |
| 96 | function f(expected) { |
| 97 | assertEquals(expected, new.target); |
| 98 | } |
| 99 | class Derived extends f { |
| 100 | constructor(expected) { |
| 101 | super(expected); |
| 102 | assertEquals(expected, new.target); |
| 103 | calls++; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | new Derived(Derived); |
| 108 | new Derived(Derived, 'extra'); |
| 109 | assertEquals(2, calls); |
| 110 | })(); |
| 111 | |
| 112 | |
| 113 | (function TestFunctionReturnObject() { |
| 114 | function f(expected) { |
| 115 | assertEquals(expected, new.target); |
| 116 | return /abc/; |
| 117 | } |
| 118 | |
| 119 | assertInstanceof(new f(f), RegExp); |
| 120 | assertInstanceof(new f(f, 'extra'), RegExp); |
| 121 | |
| 122 | assertInstanceof(f(undefined), RegExp); |
| 123 | assertInstanceof(f(), RegExp); |
| 124 | assertInstanceof(f(undefined, 'extra'), RegExp); |
| 125 | })(); |
| 126 | |
| 127 | |
| 128 | (function TestClassReturnObject() { |
| 129 | 'use strict'; |
| 130 | |
| 131 | class Base { |
| 132 | constructor(expected) { |
| 133 | assertEquals(expected, new.target); |
| 134 | return /abc/; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | assertInstanceof(new Base(Base), RegExp); |
| 139 | assertInstanceof(new Base(Base, 'extra'), RegExp); |
| 140 | |
| 141 | class Derived extends Base {} |
| 142 | assertInstanceof(new Derived(Derived), RegExp); |
| 143 | assertInstanceof(new Derived(Derived, 'extra'), RegExp); |
| 144 | |
| 145 | class Derived2 extends Base { |
| 146 | constructor(expected) { |
| 147 | super(expected); |
| 148 | assertInstanceof(this, RegExp); |
| 149 | } |
| 150 | } |
| 151 | assertInstanceof(new Derived2(Derived2), RegExp); |
| 152 | assertInstanceof(new Derived2(Derived2, 'extra'), RegExp); |
| 153 | })(); |
| 154 | |
| 155 | |
| 156 | (function TestReflectConstruct() { |
| 157 | var calls = 0; |
| 158 | function f(expected) { |
| 159 | calls++; |
| 160 | assertEquals(expected, new.target); |
| 161 | } |
| 162 | |
| 163 | var o = Reflect.construct(f, [f]); |
| 164 | assertEquals(Object.getPrototypeOf(o), f.prototype); |
| 165 | o = Reflect.construct(f, [f, 'extra']); |
| 166 | assertEquals(Object.getPrototypeOf(o), f.prototype); |
| 167 | assertEquals(2, calls); |
| 168 | |
| 169 | calls = 0; |
| 170 | o = Reflect.construct(f, [f], f); |
| 171 | assertEquals(Object.getPrototypeOf(o), f.prototype); |
| 172 | o = Reflect.construct(f, [f, 'extra'], f); |
| 173 | assertEquals(Object.getPrototypeOf(o), f.prototype); |
| 174 | assertEquals(2, calls); |
| 175 | |
| 176 | |
| 177 | function g() {} |
| 178 | calls = 0; |
| 179 | o = Reflect.construct(f, [g], g); |
| 180 | assertEquals(Object.getPrototypeOf(o), g.prototype); |
| 181 | o = Reflect.construct(f, [g, 'extra'], g); |
| 182 | assertEquals(Object.getPrototypeOf(o), g.prototype); |
| 183 | assertEquals(2, calls); |
| 184 | })(); |
| 185 | |
| 186 | |
| 187 | (function TestRestParametersFunction() { |
| 188 | function f(...rest) { |
| 189 | assertEquals(rest[0], new.target); |
| 190 | } |
| 191 | |
| 192 | assertInstanceof(new f(f), f); |
| 193 | assertInstanceof(new f(f, 'extra'), f); |
| 194 | })(); |
| 195 | |
| 196 | |
| 197 | (function TestRestParametersClass() { |
| 198 | 'use strict'; |
| 199 | |
| 200 | class Base { |
| 201 | constructor(...rest) { |
| 202 | assertEquals(rest[0], new.target); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | assertInstanceof(new Base(Base), Base); |
| 207 | assertInstanceof(new Base(Base, 'extra'), Base); |
| 208 | |
| 209 | class Derived extends Base {} |
| 210 | |
| 211 | assertInstanceof(new Derived(Derived), Derived); |
| 212 | assertInstanceof(new Derived(Derived, 'extra'), Derived); |
| 213 | })(); |
| 214 | |
| 215 | |
| 216 | (function TestArrowFunction() { |
| 217 | function f(expected) { |
| 218 | (() => { |
| 219 | assertEquals(expected, new.target); |
| 220 | })(); |
| 221 | } |
| 222 | |
| 223 | assertInstanceof(new f(f), f); |
| 224 | assertInstanceof(new f(f, 'extra'), f); |
| 225 | })(); |
| 226 | |
| 227 | |
| 228 | (function TestRestParametersClass() { |
| 229 | 'use strict'; |
| 230 | |
| 231 | class Base { |
| 232 | constructor(expected) { |
| 233 | (() => { |
| 234 | assertEquals(expected, new.target); |
| 235 | })(); |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | assertInstanceof(new Base(Base), Base); |
| 240 | assertInstanceof(new Base(Base, 'extra'), Base); |
| 241 | |
| 242 | class Derived extends Base {} |
| 243 | |
| 244 | assertInstanceof(new Derived(Derived), Derived); |
| 245 | assertInstanceof(new Derived(Derived, 'extra'), Derived); |
| 246 | })(); |
| 247 | |
| 248 | |
| 249 | (function TestSloppyArguments() { |
| 250 | var length, a0, a1, a2, nt; |
| 251 | function f(x) { |
| 252 | assertEquals(length, arguments.length); |
| 253 | assertEquals(a0, arguments[0]); |
| 254 | assertEquals(a1, arguments[1]); |
| 255 | assertEquals(a2, arguments[2]); |
| 256 | assertEquals(nt, new.target); |
| 257 | |
| 258 | if (length > 0) { |
| 259 | x = 42; |
| 260 | assertEquals(42, x); |
| 261 | assertEquals(42, arguments[0]); |
| 262 | |
| 263 | arguments[0] = 33; |
| 264 | assertEquals(33, x); |
| 265 | assertEquals(33, arguments[0]); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | nt = f; |
| 270 | length = 0; |
| 271 | new f(); |
| 272 | |
| 273 | length = 1; |
| 274 | a0 = 1; |
| 275 | new f(1); |
| 276 | |
| 277 | length = 2; |
| 278 | a0 = 1; |
| 279 | a1 = 2; |
| 280 | new f(1, 2); |
| 281 | |
| 282 | length = 3; |
| 283 | a0 = 1; |
| 284 | a1 = 2; |
| 285 | a2 = 3; |
| 286 | new f(1, 2, 3); |
| 287 | |
| 288 | nt = undefined; |
| 289 | a0 = a1 = a2 = undefined; |
| 290 | length = 0; |
| 291 | f(); |
| 292 | |
| 293 | length = 1; |
| 294 | a0 = 1; |
| 295 | f(1); |
| 296 | |
| 297 | length = 2; |
| 298 | a0 = 1; |
| 299 | a1 = 2; |
| 300 | f(1, 2); |
| 301 | |
| 302 | length = 3; |
| 303 | a0 = 1; |
| 304 | a1 = 2; |
| 305 | a2 = 3; |
| 306 | f(1, 2, 3); |
| 307 | })(); |
| 308 | |
| 309 | |
| 310 | (function TestStrictArguments() { |
| 311 | var length, a0, a1, a2, nt; |
| 312 | function f(x) { |
| 313 | 'use strict'; |
| 314 | assertEquals(length, arguments.length); |
| 315 | assertEquals(a0, arguments[0]); |
| 316 | assertEquals(a1, arguments[1]); |
| 317 | assertEquals(a2, arguments[2]); |
| 318 | assertEquals(nt, new.target); |
| 319 | |
| 320 | if (length > 0) { |
| 321 | x = 42; |
| 322 | assertEquals(a0, arguments[0]); |
| 323 | |
| 324 | arguments[0] = 33; |
| 325 | assertEquals(33, arguments[0]); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | nt = f; |
| 330 | length = 0; |
| 331 | new f(); |
| 332 | |
| 333 | length = 1; |
| 334 | a0 = 1; |
| 335 | new f(1); |
| 336 | |
| 337 | length = 2; |
| 338 | a0 = 1; |
| 339 | a1 = 2; |
| 340 | new f(1, 2); |
| 341 | |
| 342 | length = 3; |
| 343 | a0 = 1; |
| 344 | a1 = 2; |
| 345 | a2 = 3; |
| 346 | new f(1, 2, 3); |
| 347 | |
| 348 | nt = undefined; |
| 349 | a0 = a1 = a2 = undefined; |
| 350 | length = 0; |
| 351 | f(); |
| 352 | |
| 353 | length = 1; |
| 354 | a0 = 1; |
| 355 | f(1); |
| 356 | |
| 357 | length = 2; |
| 358 | a0 = 1; |
| 359 | a1 = 2; |
| 360 | f(1, 2); |
| 361 | |
| 362 | length = 3; |
| 363 | a0 = 1; |
| 364 | a1 = 2; |
| 365 | a2 = 3; |
| 366 | f(1, 2, 3); |
| 367 | })(); |
| 368 | |
| 369 | |
| 370 | (function TestOtherScopes() { |
| 371 | function f1() { return eval("'use strict'; new.target") } |
| 372 | assertSame(f1, new f1); |
| 373 | function f2() { with ({}) return new.target } |
| 374 | assertSame(f2, new f2); |
| 375 | function f3({a}) { return new.target } |
| 376 | assertSame(f3, new f3({})); |
| 377 | function f4(...a) { return new.target } |
| 378 | assertSame(f4, new f4); |
| 379 | function f5() { 'use strict'; { let x; return new.target } } |
| 380 | assertSame(f5, new f5); |
| 381 | function f6() { with ({'new.target': 42}) return new.target } |
| 382 | assertSame(f6, new f6); |
| 383 | })(); |
| 384 | |
| 385 | |
| 386 | // Has to be top-level to be inlined. |
| 387 | function get_new_target() { return new.target; } |
| 388 | (function TestInlining() { |
| 389 | "use strict"; |
| 390 | new function() { assertEquals(undefined, get_new_target()); } |
| 391 | new function() { assertEquals(get_new_target, new get_new_target()); } |
| 392 | |
| 393 | class A extends get_new_target { |
| 394 | constructor() { |
| 395 | var new_target = super(); |
| 396 | this.new_target = new_target; |
| 397 | } |
| 398 | } |
| 399 | assertEquals(A, new A().new_target); |
| 400 | })(); |
| 401 | |
| 402 | |
| 403 | (function TestEarlyErrors() { |
| 404 | assertThrows(function() { Function("new.target = 42"); }, ReferenceError); |
| 405 | assertThrows(function() { Function("var foo = 1; new.target = foo = 42"); }, ReferenceError); |
| 406 | assertThrows(function() { Function("var foo = 1; foo = new.target = 42"); }, ReferenceError); |
| 407 | assertThrows(function() { Function("new.target--"); }, ReferenceError); |
| 408 | assertThrows(function() { Function("--new.target"); }, ReferenceError); |
| 409 | assertThrows(function() { Function("(new.target)++"); }, ReferenceError); |
| 410 | assertThrows(function() { Function("++(new.target)"); }, ReferenceError); |
| 411 | assertThrows(function() { Function("for (new.target of {});"); }, SyntaxError); |
| 412 | })(); |