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 | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 5 | // Flags: --harmony-sloppy --harmony-sloppy-let |
| 6 | // Flags: --harmony-sloppy-function |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 7 | |
| 8 | // Test Annex B 3.3 semantics for functions declared in blocks in sloppy mode. |
| 9 | // http://www.ecma-international.org/ecma-262/6.0/#sec-block-level-function-declarations-web-legacy-compatibility-semantics |
| 10 | |
| 11 | (function overridingLocalFunction() { |
| 12 | var x = []; |
| 13 | assertEquals('function', typeof f); |
| 14 | function f() { |
| 15 | x.push(1); |
| 16 | } |
| 17 | f(); |
| 18 | { |
| 19 | f(); |
| 20 | function f() { |
| 21 | x.push(2); |
| 22 | } |
| 23 | f(); |
| 24 | } |
| 25 | f(); |
| 26 | { |
| 27 | f(); |
| 28 | function f() { |
| 29 | x.push(3); |
| 30 | } |
| 31 | f(); |
| 32 | } |
| 33 | f(); |
| 34 | assertArrayEquals([1, 2, 2, 2, 3, 3, 3], x); |
| 35 | })(); |
| 36 | |
| 37 | (function newFunctionBinding() { |
| 38 | var x = []; |
| 39 | assertEquals('undefined', typeof f); |
| 40 | { |
| 41 | f(); |
| 42 | function f() { |
| 43 | x.push(2); |
| 44 | } |
| 45 | f(); |
| 46 | } |
| 47 | f(); |
| 48 | { |
| 49 | f(); |
| 50 | function f() { |
| 51 | x.push(3); |
| 52 | } |
| 53 | f(); |
| 54 | } |
| 55 | f(); |
| 56 | assertArrayEquals([2, 2, 2, 3, 3, 3], x); |
| 57 | })(); |
| 58 | |
| 59 | (function shadowingLetDoesntBind() { |
| 60 | let f = 1; |
| 61 | assertEquals(1, f); |
| 62 | { |
| 63 | let y = 3; |
| 64 | function f() { |
| 65 | y = 2; |
| 66 | } |
| 67 | f(); |
| 68 | assertEquals(2, y); |
| 69 | } |
| 70 | assertEquals(1, f); |
| 71 | })(); |
| 72 | |
| 73 | (function shadowingClassDoesntBind() { |
| 74 | class f { } |
| 75 | assertEquals('class f { }', f.toString()); |
| 76 | { |
| 77 | let y = 3; |
| 78 | function f() { |
| 79 | y = 2; |
| 80 | } |
| 81 | f(); |
| 82 | assertEquals(2, y); |
| 83 | } |
| 84 | assertEquals('class f { }', f.toString()); |
| 85 | })(); |
| 86 | |
| 87 | (function shadowingConstDoesntBind() { |
| 88 | const f = 1; |
| 89 | assertEquals(1, f); |
| 90 | { |
| 91 | let y = 3; |
| 92 | function f() { |
| 93 | y = 2; |
| 94 | } |
| 95 | f(); |
| 96 | assertEquals(2, y); |
| 97 | } |
| 98 | assertEquals(1, f); |
| 99 | })(); |
| 100 | |
| 101 | (function shadowingVarBinds() { |
| 102 | var f = 1; |
| 103 | assertEquals(1, f); |
| 104 | { |
| 105 | let y = 3; |
| 106 | function f() { |
| 107 | y = 2; |
| 108 | } |
| 109 | f(); |
| 110 | assertEquals(2, y); |
| 111 | } |
| 112 | assertEquals('function', typeof f); |
| 113 | })(); |
| 114 | |
| 115 | (function conditional() { |
| 116 | if (true) { |
| 117 | function f() { return 1; } |
| 118 | } else { |
| 119 | function f() { return 2; } |
| 120 | } |
| 121 | assertEquals(1, f()); |
| 122 | |
| 123 | if (false) { |
| 124 | function g() { return 1; } |
| 125 | } else { |
| 126 | function g() { return 2; } |
| 127 | } |
| 128 | assertEquals(2, g()); |
| 129 | })(); |
| 130 | |
| 131 | (function skipExecution() { |
| 132 | { |
| 133 | function f() { return 1; } |
| 134 | } |
| 135 | assertEquals(1, f()); |
| 136 | { |
| 137 | function f() { return 2; } |
| 138 | } |
| 139 | assertEquals(2, f()); |
| 140 | L: { |
| 141 | assertEquals(3, f()); |
| 142 | break L; |
| 143 | function f() { return 3; } |
| 144 | } |
| 145 | assertEquals(2, f()); |
| 146 | })(); |
| 147 | |
| 148 | // Test that shadowing arguments is fine |
| 149 | (function shadowArguments(x) { |
| 150 | assertArrayEquals([1], arguments); |
| 151 | { |
| 152 | assertEquals('function', typeof arguments); |
| 153 | function arguments() {} |
| 154 | assertEquals('function', typeof arguments); |
| 155 | } |
| 156 | assertEquals('function', typeof arguments); |
| 157 | })(1); |
| 158 | |
| 159 | // Shadow function parameter |
| 160 | (function shadowParameter(x) { |
| 161 | assertEquals(1, x); |
| 162 | { |
| 163 | function x() {} |
| 164 | } |
| 165 | assertEquals('function', typeof x); |
| 166 | })(1); |
| 167 | |
| 168 | // Shadow function parameter |
| 169 | (function shadowDefaultParameter(x = 0) { |
| 170 | assertEquals(1, x); |
| 171 | { |
| 172 | function x() {} |
| 173 | } |
| 174 | // TODO(littledan): Once destructured parameters are no longer |
| 175 | // let-bound, enable this assertion. This is the core of the test. |
| 176 | // assertEquals('function', typeof x); |
| 177 | })(1); |
| 178 | |
| 179 | (function shadowRestParameter(...x) { |
| 180 | assertArrayEquals([1], x); |
| 181 | { |
| 182 | function x() {} |
| 183 | } |
| 184 | // TODO(littledan): Once destructured parameters are no longer |
| 185 | // let-bound, enable this assertion. This is the core of the test. |
| 186 | // assertEquals('function', typeof x); |
| 187 | })(1); |
| 188 | |
| 189 | assertThrows(function notInDefaultScope(x = y) { |
| 190 | { |
| 191 | function y() {} |
| 192 | } |
| 193 | assertEquals('function', typeof y); |
| 194 | assertEquals(x, undefined); |
| 195 | }, ReferenceError); |
| 196 | |
| 197 | // Test that hoisting from blocks does happen in global scope |
| 198 | function globalHoisted() { return 0; } |
| 199 | { |
| 200 | function globalHoisted() { return 1; } |
| 201 | } |
| 202 | assertEquals(1, globalHoisted()); |
| 203 | |
| 204 | // Also happens when not previously defined |
| 205 | assertEquals(undefined, globalUndefinedHoisted); |
| 206 | { |
| 207 | function globalUndefinedHoisted() { return 1; } |
| 208 | } |
| 209 | assertEquals(1, globalUndefinedHoisted()); |
| 210 | var globalUndefinedHoistedDescriptor = |
| 211 | Object.getOwnPropertyDescriptor(this, "globalUndefinedHoisted"); |
| 212 | assertFalse(globalUndefinedHoistedDescriptor.configurable); |
| 213 | assertTrue(globalUndefinedHoistedDescriptor.writable); |
| 214 | assertTrue(globalUndefinedHoistedDescriptor.enumerable); |
| 215 | assertEquals(1, globalUndefinedHoistedDescriptor.value()); |
| 216 | |
| 217 | // When a function property is hoisted, it should be |
| 218 | // made enumerable. |
| 219 | // BUG(v8:4451) |
| 220 | Object.defineProperty(this, "globalNonEnumerable", { |
| 221 | value: false, |
| 222 | configurable: true, |
| 223 | writable: true, |
| 224 | enumerable: false |
| 225 | }); |
| 226 | eval("{function globalNonEnumerable() { return 1; }}"); |
| 227 | var globalNonEnumerableDescriptor |
| 228 | = Object.getOwnPropertyDescriptor(this, "globalNonEnumerable"); |
| 229 | // BUG(v8:4451): Should be made non-configurable |
| 230 | assertTrue(globalNonEnumerableDescriptor.configurable); |
| 231 | assertTrue(globalNonEnumerableDescriptor.writable); |
| 232 | // BUG(v8:4451): Should be made enumerable |
| 233 | assertFalse(globalNonEnumerableDescriptor.enumerable); |
| 234 | assertEquals(1, globalNonEnumerableDescriptor.value()); |
| 235 | |
| 236 | // When a function property is hoisted, it should be overwritten and |
| 237 | // made writable and overwritten, even if the property was non-writable. |
| 238 | Object.defineProperty(this, "globalNonWritable", { |
| 239 | value: false, |
| 240 | configurable: true, |
| 241 | writable: false, |
| 242 | enumerable: true |
| 243 | }); |
| 244 | eval("{function globalNonWritable() { return 1; }}"); |
| 245 | var globalNonWritableDescriptor |
| 246 | = Object.getOwnPropertyDescriptor(this, "globalNonWritable"); |
| 247 | // BUG(v8:4451): Should be made non-configurable |
| 248 | assertTrue(globalNonWritableDescriptor.configurable); |
| 249 | // BUG(v8:4451): Should be made writable |
| 250 | assertFalse(globalNonWritableDescriptor.writable); |
| 251 | assertFalse(globalNonEnumerableDescriptor.enumerable); |
| 252 | // BUG(v8:4451): Should be overwritten |
| 253 | assertEquals(false, globalNonWritableDescriptor.value); |
| 254 | |
| 255 | // Test that hoisting from blocks does happen in an eval |
| 256 | eval(` |
| 257 | function evalHoisted() { return 0; } |
| 258 | { |
| 259 | function evalHoisted() { return 1; } |
| 260 | } |
| 261 | assertEquals(1, evalHoisted()); |
| 262 | `); |
| 263 | |
| 264 | // Test that hoisting from blocks happens from eval in a function |
| 265 | !function() { |
| 266 | eval(` |
| 267 | function evalInFunctionHoisted() { return 0; } |
| 268 | { |
| 269 | function evalInFunctionHoisted() { return 1; } |
| 270 | } |
| 271 | assertEquals(1, evalInFunctionHoisted()); |
| 272 | `); |
| 273 | }(); |
| 274 | |
| 275 | let dontHoistGlobal; |
| 276 | { function dontHoistGlobal() {} } |
| 277 | assertEquals(undefined, dontHoistGlobal); |
| 278 | |
| 279 | let dontHoistEval; |
| 280 | // BUG(v8:) This shouldn't hoist and shouldn't throw |
| 281 | var throws = false; |
| 282 | try { |
| 283 | eval("{ function dontHoistEval() {} }"); |
| 284 | } catch (e) { |
| 285 | throws = true; |
| 286 | } |
| 287 | assertTrue(throws); |
| 288 | |
| 289 | // When the global object is frozen, silently don't hoist |
| 290 | // Currently this actually throws BUG(v8:4452) |
| 291 | Object.freeze(this); |
| 292 | throws = false; |
| 293 | try { |
| 294 | eval('{ function hoistWhenFrozen() {} }'); |
| 295 | } catch (e) { |
| 296 | throws = true; |
| 297 | } |
| 298 | assertFalse(this.hasOwnProperty("hoistWhenFrozen")); |
| 299 | assertThrows(() => hoistWhenFrozen, ReferenceError); |
| 300 | // Should be assertFalse BUG(v8:4452) |
| 301 | assertTrue(throws); |