cptn-a-fall-thru-abrupt-empty.js (2220B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 es6id: 13.12.11 5 description: > 6 Completion value when execution continues through multiple cases and ends 7 with an empty abrupt completion 8 info: | 9 SwitchStatement : switch ( Expression ) CaseBlock 10 11 [...] 12 8. Let R be the result of performing CaseBlockEvaluation of CaseBlock with 13 argument switchValue. 14 9. Set the running execution context’s LexicalEnvironment to oldEnv. 15 10. Return R. 16 17 13.12.9 Runtime Semantics: CaseBlockEvaluation 18 19 CaseBlock : { CaseClausesopt DefaultClause CaseClausesopt } 20 21 1. Let V = undefined. 22 2. Let A be the list of CaseClause items in the first CaseClauses, in 23 source text order. If the first CaseClauses is not present A is « ». 24 3. Let found be false. 25 4. Repeat for each CaseClause C in A 26 a. If found is false, then 27 [...] 28 b. If found is true, then 29 i. Let R be the result of evaluating C. 30 ii. If R.[[value]] is not empty, let V = R.[[value]]. 31 iii. If R is an abrupt completion, return Completion(UpdateEmpty(R, 32 V)). 33 ---*/ 34 35 assert.sameValue( 36 eval('1; switch ("a") { case "a": 2; case "b": 3; break; default: }'), 37 3, 38 'Non-empty value replaces previous non-empty value' 39 ); 40 assert.sameValue( 41 eval('4; switch ("a") { case "a": case "b": 5; break; default: }'), 42 5, 43 'Non-empty value replaces empty value' 44 ); 45 assert.sameValue( 46 eval('6; switch ("a") { case "a": 7; case "b": break; default: }'), 47 7, 48 'Empty value does not replace previous non-empty value' 49 ); 50 51 assert.sameValue( 52 eval('8; do { switch ("a") { case "a": 9; case "b": 10; continue; default: } } while (false)'), 53 10, 54 'Non-empty value replaces previous non-empty value' 55 ); 56 assert.sameValue( 57 eval('11; do { switch ("a") { case "a": case "b": 12; continue; default: } } while (false)'), 58 12, 59 'Non-empty value replaces empty value' 60 ); 61 assert.sameValue( 62 eval('13; do { switch ("a") { case "a": 14; case "b": continue; default: } } while (false)'), 63 14, 64 'Empty value does not replace previous non-empty value' 65 ); 66 67 reportCompare(0, 0);