tests/stress/modify-map-during-iteration.js

   1
   2 function testValue(value, expected) {
   3     if (value !== expected)
   4         throw new Error("bad value: expected:(" + expected + "),actual:(" + value +").");
   5 }
   6
   7 function identityPairs(array) {
   8     return array.map(function (i) { return [i, i]; });
   9 }
  10
  11 var map = new Map(identityPairs([0]));
  12 var counter = 0;
  13 for (var [elm, _] of map) {
  14     testValue(elm, counter);
  15     map.set(elm + 1, elm + 1);
  16     if (elm > 10000) {
  17         map.clear();
  18     }
  19     ++counter;
  20 }
  21 testValue(counter, 10002);
  22
  23 var map = new Map(identityPairs([0, 1, 2, 3]));
  24 var counter = 0;
  25 for (var [elm, _] of map) {
  26     testValue(elm, counter);
  27     map.clear();
  28     ++counter;
  29 }
  30 testValue(counter, 1);
  31
  32 var map = new Map(identityPairs([0, 1, 2, 3]));
  33 var exp = [0, 2, 3];
  34 var counter = 0;
  35 for (var [elm, _] of map) {
  36     testValue(elm, exp[counter]);
  37     map.delete(counter + 1);
  38     ++counter;
  39 }
  40 testValue(counter, 3);
  41
  42 var map = new Map(identityPairs([0, 1, 2, 3]));
  43 var iter = map.keys();
  44 var iter2 = map.keys();
  45 testValue(iter2.next().value, 0);
  46
  47 // Consume all output of iter.
  48 for (var elm of iter);
  49
  50 testValue(iter.next().done, true);
  51 testValue(iter.next().value, undefined);
  52
  53 map.clear();
  54 map.set(1, 1).set(2, 2).set(3, 3);
  55
  56 testValue(iter.next().done, true);
  57 testValue(iter.next().value, undefined);
  58 testValue(iter2.next().value, 1);
  59 testValue(iter2.next().value, 2);
  60 testValue(iter2.next().value, 3);
  61
  62 var map = new Map();
  63 map.set(1, 1);
  64 map.delete(1);
  65 map.forEach(function (i) {
  66     throw new Error("unreeachable.");
  67 });
  68
  69 var map = new Map();
  70 var iter = map[Symbol.iterator]();
  71 map.set(1, 1);
  72 map.delete(1);
  73 for (var [elm, _] of map) {
  74     throw new Error("unreeachable.");
  75 }
  76
  77 var map = new Map();
  78 for (var i = 0; i < 5; ++i)
  79     map.set(i, i);
  80 testValue(map.size, 5);
  81 var iter = map.keys();
  82 testValue(iter.next().value, 0);
  83 testValue(iter.next().value, 1);
  84 testValue(iter.next().value, 2);
  85 testValue(iter.next().value, 3);
  86 map.delete(0);
  87 map.delete(1);
  88 map.delete(2);
  89 map.delete(3);
  90 // It will cause MapData packing.
  91 for (var i = 5; i < 1000; ++i)
  92     map.set(i, i);
  93 gc();
  94 for (var i = 4; i < 1000; ++i)
  95     testValue(iter.next().value, i);
  96 testValue(iter.next().value, undefined);
  97