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cptn-dflt-b-fall-thru-abrupt-empty.js (3133B)

      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       [...]
     27    5. Let foundInB be false.
     28    6. Let B be the List containing the CaseClause items in the second
     29       CaseClauses, in source text order. If the second CaseClauses is not
     30       present B is « ».
     31    7. If found is false, then
     32       a. Repeat for each CaseClause C in B
     33          i. If foundInB is false, then
     34             1. Let clauseSelector be the result of CaseSelectorEvaluation of
     35                C.
     36             [...]
     37             3. Let foundInB be the result of performing Strict Equality
     38                Comparison input === clauseSelector.[[value]].
     39           ii. If foundInB is true, then
     40               [...]
     41    8. If foundInB is true, return NormalCompletion(V).
     42    9. Let R be the result of evaluating DefaultClause.
     43    10. If R.[[value]] is not empty, let V = R.[[value]].
     44    11. If R is an abrupt completion, return Completion(UpdateEmpty(R, V)).
     45    12. Repeat for each CaseClause C in B (NOTE this is another complete
     46        iteration of the second CaseClauses)
     47        a. Let R be the result of evaluating CaseClause C.
     48        b. If R.[[value]] is not empty, let V = R.[[value]].
     49        c. If R is an abrupt completion, return Completion(UpdateEmpty(R, V)).
     50 ---*/
     51 
     52 assert.sameValue(
     53  eval('1; switch ("a") { default: case "b": 2; case "c": 3; break; }'),
     54  3,
     55  'Non-empty value replaces previous non-empty value'
     56 );
     57 assert.sameValue(
     58  eval('4; switch ("a") { default: case "b": case "c": 5; break; }'),
     59  5,
     60  'Non-empty value replaces empty value'
     61 );
     62 assert.sameValue(
     63  eval('6; switch ("a") { default: case "b": 7; case "c": break; }'),
     64  7,
     65  'Empty value does not replace previous non-empty value'
     66 );
     67 
     68 assert.sameValue(
     69  eval('8; do { switch ("a") { default: case "b": 9; case "c": 10; continue; } } while (false)'),
     70  10,
     71  'Non-empty value replaces previous non-empty value'
     72 );
     73 assert.sameValue(
     74  eval('11; do { switch ("a") { default: case "b": case "c": 12; continue; } } while (false)'),
     75  12,
     76  'Non-empty value replaces empty value'
     77 );
     78 assert.sameValue(
     79  eval('13; do { switch ("a") { default: case "b": 14; case "c": continue; } } while (false)'),
     80  14,
     81  'Empty value does not replace previous non-empty value'
     82 );
     83 
     84 reportCompare(0, 0);