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Merge pull request #339 from hvitved/csharp/cfg/assertions

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C#: Detect constantly failing assertions in the CFG
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calumgrant
2018-10-26 10:32:23 +01:00
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parent fa55e31f7a a3d74b00e0
commit ec2bf914c8
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change-notes/1.19/analysis-csharp.md
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## General improvements
* The control flow graph construction now takes simple Boolean conditions on local scope variables into account. For example, in `if (b) x = 0; if (b) x = 1;`, the control flow graph will reflect that taking the `true` (resp. `false`) branch in the first condition implies taking the same branch in the second condition. In effect, the first assignment to `x` will now be identified as being dead.
* Control flow graph improvements:
* The control flow graph construction now takes simple Boolean conditions on local scope variables into account. For example, in `if (b) x = 0; if (b) x = 1;`, the control flow graph will reflect that taking the `true` (resp. `false`) branch in the first condition implies taking the same branch in the second condition. In effect, the first assignment to `x` will now be identified as being dead.
* Code that is only reachable from a constant failing assertion, such as `Debug.Assert(false)`, is considered to be unreachable.
## New queries
| **Query** | **Tags** | **Purpose** |