Multiple improvements by CodeRush Static Analysis by Himura2la · Pull Request #5132 · PowerShell/PowerShell

Himura2la · Oct 16, 2017

Hi guys!
I have checked the PowerShell solution with the CodeRush Static Analyzer and fixed several code issues. Here's the summary:

The most common issue is CRR0012: Logical OR expression has opposite operand, such expressions can be simplified.
In Words.cs our analyzers detect CRR0025: This conditional's code block does not appear to be reachable, it's obviously false positive, but these searching while loops caught my attention. They look very similar to nested conditionals and I decided to fold them into for loops without bodies, they look clearer in this form.
Several places had CRR0008: If-block matches else-block, I saved the original conditionals in comments in case they need in future
I have found the CRR0029: The ConfigureAwait(true) is called implicitly issue. The simple delay does not require saving the synchronization context, plus it's better always add an explicit ConfigureAwait() call to awaited calls.
In WSMan I found CRR0017: Expression checks 'nodelist' for null after usage and one more small issue, maybe I should add another pull request for that repository.

I hope this will help, here's the full report: CodeIssuesReport.txt. Thanks for being open source!

msftclas · Oct 16, 2017

All CLA requirements met.

PaulHigin

Thanks for finding and fixing these!

PaulHigin · Oct 16, 2017

                    else
                    {
-                        //if inside the current buffer, we still cannot read the events, as the handles.
+                        //if inside the current buffer (_currentIndex + offset >= 0), we still cannot read the events, as the handles.


This comment still doesn't make sense to me. Maybe just remove it?

OK, removing the whole comment

PaulHigin · Oct 16, 2017

-                }
-                i += 1;
-            }
+            for (; i < _singleton._buffer.Length && !InWord(i, wordDelimiters); i++) ;


I feel this is easier to read (with the additional parentheses):
for (; (i < _singleton._buffer.Length) && !InWord(I, wordDelimiters); I++);

Submit a PR to https://github.com/lzybkr/PSReadLine for any changes in the PSReadLine directory.

And I'll likely reject the change - In general I'm not a fan of empty loop bodies.

I reverted the file, this change is a anyway just a preference. Maybe I'll try to push it to the correct repository, thanks for the link.

PaulHigin · Oct 16, 2017

-                    // Since drive1 is null it is less than drive2 which is not null
-                    return false;
-                }
+                // Since both drives are null, they are equal


This doesn't look right. I believe it should be.
return (drive2Object != null);

Oh, thanks, I didn't notice that the refactoring can go even further

PaulHigin · Oct 16, 2017

-            {
-                throw PSTraceSource.NewArgumentException("name");
-            }
+            // FIXME: Other checks?


Please remove this comment and verify that helpfile, description, psSnapIn parameters can be null.

Sorry, I think I didn't catch whether I should ensure the helpfile, description and psSnapIn are not null or just remove the comment.

@Himura2la Can you either remove this comment or file an issue and update the comment to reference the issue?

PaulHigin · Oct 16, 2017

                    // writing the cache out in a timely matter isn't too important
                    // now anyway.
-                    await Task.Delay(10000);
+                    await Task.Delay(10000).ConfigureAwait(false);


It is not clear to me that this is needed. Isn't the Task always configured as "false" be default?

It seems right though, so I think it's good to keep it.

@PaulHigin As far as I know, the default option is 'true'. And that's the reason for adding an explicit ConfigureAwait() everywhere.

PaulHigin · Oct 16, 2017

+            Diagnostics.Assert(error != 0 || signature != null, "GetSignatureFromWintrustData: general crypto failure");

-            if ((signature == null) && (error != 0))
+            if (signature == null && error != 0)


I feel the code is more readable with parentheses back in. I am not sure what our coding guidelines say.

In this area, coding guidelines say - be consistent, but we also ask for no formatting changes mixed with other changes.

In reply to: 144931951 [](ancestors = 144931951)

I reverted this.
Sorry, I should have kept myself from removing parentheses everywhere. I think I write too much Python

lzybkr · Oct 16, 2017

                            {
-                                Dbg.Assert((inputRecords[0].KeyEvent.KeyDown && inputRecords[0].KeyEvent.RepeatCount != 0) ||
-                                    !inputRecords[0].KeyEvent.KeyDown,
+                                Dbg.Assert(inputRecords[0].KeyEvent.RepeatCount != 0 || !inputRecords[0].KeyEvent.KeyDown,


This changes the order of evaluation - probably safe here, but before, RepeatCount would not be evaluated if KeyDown was false.

I swapped them, thanks for noticing. Although it seems really safe assuming there's even no null-checks

lzybkr · Oct 16, 2017

                    {
-                        Dbg.Assert((inputRecords[i].KeyEvent.KeyDown && inputRecords[i].KeyEvent.RepeatCount != 0) ||
-                            !inputRecords[i].KeyEvent.KeyDown,
+                        Dbg.Assert(inputRecords[i].KeyEvent.RepeatCount != 0 || !inputRecords[i].KeyEvent.KeyDown,


This changes the order of evaluation - probably safe here, but before, RepeatCount would not be evaluated if KeyDown was false.

lzybkr · Oct 16, 2017

-            }
+            //if (!(resUri.ToLowerInvariant().Contains(URI_IPMI) || resUri.ToLowerInvariant().Contains(URI_WMI)))
+            //    tmpNs += ".xsd";
+            //This was reported by Intel as an interop issue. So now we are not appending a .xsd in the end.


This comment can probably be deleted.

OK, I also inlined the tmpNs variable. I hope it's OK

lzybkr · Oct 16, 2017

            RemotePipeline currentPipeline = (RemotePipeline)((RemoteRunspace)_runspace).GetCurrentlyRunningPipeline();
-            if (currentPipeline == null ||
-                currentPipeline != null && !ReferenceEquals(currentPipeline, this))
+            if (currentPipeline == null || !ReferenceEquals(currentPipeline, this))


I think currentPipeline == null is redundant with ReferenceEquals here.

Seems like.

TravisEz13 · Oct 16, 2017

@Himura2la What is your status on signing the CLA?

Himura2la · Oct 17, 2017

I'm done with the changes and CLA. The only thing left is extra checks here

TravisEz13 · Oct 17, 2017

@PaulHigin Just a reminder to update your review.

Restarted macOS due to random brew download failure.

PaulHigin

LGTM

TravisEz13 · Oct 18, 2017

-            {
-                throw PSTraceSource.NewArgumentException("name");
-            }
+            // FIXME: Other checks?


@Himura2la Can you either remove this comment or file an issue and update the comment to reference the issue?

TravisEz13 · Oct 18, 2017

I'm following up on one issue. Hopefully there will be no more delays once I have the answer.

Himura2la · Oct 18, 2017

@TravisEz13, I've removed the comment in my second commit

TravisEz13 · Oct 18, 2017

@Himura2la Yeah, that is not the issue.

iSazonov · Nov 8, 2017

Is the PR ready to merge?

Himura2la · Nov 8, 2017

I wonder

SteveL-MSFT · Nov 8, 2017

@TravisEz13 is this ready to merge?

Multiple improvements by CodeRush Static Analysis

b829325

Himura2la requested review from BrucePay, PaulHigin, adityapatwardhan, anmenaga, charub, dantraMSFT, daxian-dbw, lzybkr, mirichmo and vors as code owners October 16, 2017 14:37

daxian-dbw assigned TravisEz13 Oct 16, 2017

PaulHigin suggested changes Oct 16, 2017

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lzybkr reviewed Oct 16, 2017

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Changes to PR from the Team

4effc48

lzybkr approved these changes Oct 17, 2017

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PaulHigin approved these changes Oct 17, 2017

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TravisEz13 requested changes Oct 18, 2017

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TravisEz13 approved these changes Oct 18, 2017

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TravisEz13 merged commit 6530b77 into PowerShell:master Nov 10, 2017

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TravisEz13 commented Oct 16, 2017

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