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C#: Add a few more is (not) null tests
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‎csharp/ql/test/query-tests/Nullness/E.cs

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@@ -431,6 +431,29 @@ static bool Ex44(int? i, IEnumerable<int> @is)
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i = null;
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return @is.Any();
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}
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static void Ex45(string s)
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{
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if (s is null)
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{
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s.ToString(); // BAD (always)
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}
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if (s is not not null)
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{
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s.ToString(); // BAD (always) (FALSE NEGATIVE)
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}
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if (s is not null)
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{
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s.ToString(); // GOOD
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}
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if (s is object)
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{
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s.ToString(); // GOOD
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}
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}
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}
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public static class Extensions

‎csharp/ql/test/query-tests/Nullness/EqualityCheck.expected

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@@ -244,6 +244,8 @@
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| E.cs:423:33:423:44 | ... == ... | true | E.cs:423:38:423:44 | access to property Value | E.cs:423:33:423:33 | access to parameter j |
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| E.cs:430:34:430:45 | ... == ... | true | E.cs:430:34:430:34 | access to parameter j | E.cs:430:39:430:45 | access to property Value |
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| E.cs:430:34:430:45 | ... == ... | true | E.cs:430:39:430:45 | access to property Value | E.cs:430:34:430:34 | access to parameter j |
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| E.cs:437:13:437:21 | ... is ... | true | E.cs:437:13:437:13 | access to parameter s | E.cs:437:18:437:21 | null |
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| E.cs:437:13:437:21 | ... is ... | true | E.cs:437:18:437:21 | null | E.cs:437:13:437:13 | access to parameter s |
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| Forwarding.cs:59:13:59:21 | ... == ... | true | Forwarding.cs:59:13:59:13 | access to parameter o | Forwarding.cs:59:18:59:21 | null |
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| Forwarding.cs:59:13:59:21 | ... == ... | true | Forwarding.cs:59:18:59:21 | null | Forwarding.cs:59:13:59:13 | access to parameter o |
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| Forwarding.cs:78:16:78:39 | call to method ReferenceEquals | true | Forwarding.cs:78:32:78:32 | access to parameter o | Forwarding.cs:78:35:78:38 | null |

‎csharp/ql/test/query-tests/Nullness/Implications.expected

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@@ -1300,6 +1300,11 @@
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| E.cs:429:13:429:22 | access to property HasValue | true | E.cs:429:13:429:13 | access to parameter i | non-null |
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| E.cs:432:16:432:24 | call to method Any<Int32> | false | E.cs:432:16:432:18 | access to parameter is | empty |
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| E.cs:432:16:432:24 | call to method Any<Int32> | true | E.cs:432:16:432:18 | access to parameter is | non-empty |
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| E.cs:437:13:437:21 | ... is ... | false | E.cs:437:13:437:13 | access to parameter s | non-null |
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| E.cs:437:13:437:21 | ... is ... | true | E.cs:437:13:437:13 | access to parameter s | null |
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| E.cs:442:13:442:29 | ... is ... | true | E.cs:442:13:442:13 | access to parameter s | non-null |
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| E.cs:447:13:447:25 | ... is ... | true | E.cs:447:13:447:13 | access to parameter s | non-null |
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| E.cs:452:13:452:23 | ... is ... | true | E.cs:452:13:452:13 | access to parameter s | non-null |
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| Forwarding.cs:9:13:9:30 | !... | false | Forwarding.cs:9:14:9:30 | call to method IsNullOrEmpty | true |
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| Forwarding.cs:9:13:9:30 | !... | true | Forwarding.cs:9:14:9:30 | call to method IsNullOrEmpty | false |
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| Forwarding.cs:9:14:9:14 | access to local variable s | empty | Forwarding.cs:7:20:7:23 | null | empty |

‎csharp/ql/test/query-tests/Nullness/NullAlways.expected

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@@ -37,6 +37,7 @@
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| E.cs:324:13:324:14 | access to parameter s2 | Variable $@ is always null at this dereference. | E.cs:319:40:319:41 | s2 | s2 |
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| E.cs:331:9:331:9 | access to local variable x | Variable $@ is always null at this dereference. | E.cs:330:13:330:13 | x | x |
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| E.cs:405:16:405:16 | access to local variable i | Variable $@ is always null at this dereference. | E.cs:403:14:403:14 | i | i |
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| E.cs:439:13:439:13 | access to parameter s | Variable $@ is always null at this dereference. | E.cs:435:29:435:29 | s | s |
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| Forwarding.cs:36:31:36:31 | access to local variable s | Variable $@ is always null at this dereference. | Forwarding.cs:7:16:7:16 | s | s |
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| Forwarding.cs:40:27:40:27 | access to local variable s | Variable $@ is always null at this dereference. | Forwarding.cs:7:16:7:16 | s | s |
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| NullAlwaysBad.cs:9:30:9:30 | access to parameter s | Variable $@ is always null at this dereference. | NullAlwaysBad.cs:7:29:7:29 | s | s |

‎csharp/ql/test/query-tests/Nullness/NullCheck.expected

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@@ -298,6 +298,11 @@
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| E.cs:422:13:422:22 | access to property HasValue | E.cs:422:13:422:13 | access to parameter i | true | false |
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| E.cs:429:13:429:22 | access to property HasValue | E.cs:429:13:429:13 | access to parameter i | false | true |
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| E.cs:429:13:429:22 | access to property HasValue | E.cs:429:13:429:13 | access to parameter i | true | false |
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| E.cs:437:13:437:21 | ... is ... | E.cs:437:13:437:13 | access to parameter s | false | false |
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| E.cs:437:13:437:21 | ... is ... | E.cs:437:13:437:13 | access to parameter s | true | true |
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| E.cs:442:13:442:29 | ... is ... | E.cs:442:13:442:13 | access to parameter s | true | false |
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| E.cs:447:13:447:25 | ... is ... | E.cs:447:13:447:13 | access to parameter s | true | false |
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| E.cs:452:13:452:23 | ... is ... | E.cs:452:13:452:13 | access to parameter s | true | false |
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| Forwarding.cs:9:14:9:30 | call to method IsNullOrEmpty | Forwarding.cs:9:14:9:14 | access to local variable s | false | false |
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| Forwarding.cs:14:13:14:32 | call to method IsNotNullOrEmpty | Forwarding.cs:14:13:14:13 | access to local variable s | true | false |
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| Forwarding.cs:19:14:19:23 | call to method IsNull | Forwarding.cs:19:14:19:14 | access to local variable s | false | false |

‎csharp/ql/test/query-tests/Nullness/NullMaybe.expected

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@@ -408,6 +408,9 @@ nodes
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| E.cs:405:16:405:16 | access to local variable i |
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| E.cs:417:24:417:40 | SSA capture def(i) |
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| E.cs:417:34:417:34 | access to parameter i |
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| E.cs:435:29:435:29 | SSA param(s) |
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| E.cs:437:13:437:21 | [true] ... is ... |
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| E.cs:439:13:439:13 | access to parameter s |
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| Forwarding.cs:7:16:7:23 | SSA def(s) |
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| Forwarding.cs:9:13:9:30 | [false] !... |
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| Forwarding.cs:14:9:17:9 | if (...) ... |
@@ -798,6 +801,8 @@ edges
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| E.cs:404:9:404:18 | SSA def(i) | E.cs:405:16:405:16 | access to local variable i |
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| E.cs:404:9:404:18 | SSA def(i) | E.cs:405:16:405:16 | access to local variable i |
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| E.cs:417:24:417:40 | SSA capture def(i) | E.cs:417:34:417:34 | access to parameter i |
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| E.cs:435:29:435:29 | SSA param(s) | E.cs:437:13:437:21 | [true] ... is ... |
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| E.cs:437:13:437:21 | [true] ... is ... | E.cs:439:13:439:13 | access to parameter s |
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| Forwarding.cs:7:16:7:23 | SSA def(s) | Forwarding.cs:9:13:9:30 | [false] !... |
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| Forwarding.cs:9:13:9:30 | [false] !... | Forwarding.cs:14:9:17:9 | if (...) ... |
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| Forwarding.cs:14:9:17:9 | if (...) ... | Forwarding.cs:19:9:22:9 | if (...) ... |

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