Revert "Fix slow execution when many breakpoints are used (#14953)" #20042

andyleejordan · 2023-07-28T21:03:41Z

PR Summary

This reverts commit d8decdc.

This commit broke the VS Code extension's debugger, and should be
reverted until such time that the root cause is found and a fix applied.

Also disable false assertion that blocks pwsh on Parallels VM.

PR Context

The resolves PowerShell/vscode-powershell#4668, where the VS Code extension's debugger no longer worked with preview.4. First I confirmed that it worked with preview.3, then I cloned and built from source. After looking at the diff between preview.3 and preview.4 for changes that affected the debugger in the engine, I only found #14953. While I've looked at the changes in that PR, I haven't yet isolated what broke things; but I reverted the merge commit and confirmed the debugger works again.

PR Checklist

This reverts commit d8decdc. This commit broke the VS Code extension's debugger, and should be reverted until such time that the root cause is found and a fix applied.

pull-request-quantifier-deprecated · 2023-07-28T21:04:10Z

This PR has 85 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Small
Size       : +39 -46
Percentile : 34%

Total files changed: 4

Change summary by file extension:
.cs : +39 -46

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daxian-dbw · 2023-07-28T23:47:11Z

src/System.Management.Automation/engine/Interop/Windows/QueryDosDevice.cs

+                            // TODO: This actually hit in a Parallels VM, so it's not quite dead yet!
+                            // Diagnostics.Assert(false, "Really it is a dead code since GetDosDevice() is called only if PSDrive.DriveType == DriveType.Network");


Please open an issue about this and mark it "7.4-Blocking".

Which commit, the debugger being broken or the executable failing on my VM, or both?

Open an issue about the fact that this assertion is wrong on Parallels VM. This code path needs to be reviewed as the assumption is incorrect. Can you please find out what the PSDrive.DriveType is when running in Parallel VM?

@andyleejordan Can you please check what PSDrive.DriveType is when the assertion fails in Parallel VM and share that info in #20043? Thanks!

andyleejordan · 2023-07-29T00:02:11Z

@daxian-dbw filed #20043 and #20044

iSazonov · 2023-07-29T02:23:36Z

src/System.Management.Automation/engine/Interop/Windows/QueryDosDevice.cs

                        {
-                            Diagnostics.Assert(false, "Really it is a dead code since GetDosDevice() is called only if PSDrive.DriveType == DriveType.Network");
+                            // TODO: This actually hit in a Parallels VM, so it's not quite dead yet!
+                            // Diagnostics.Assert(false, "Really it is a dead code since GetDosDevice() is called only if PSDrive.DriveType == DriveType.Network");


This is a fallback from another p/invoke GetUNCForNetworkDrive - it is main code path. This says that something can work incorrectly on Parallels VM.
So I suggest investigate the issue in separate PR. Perhaps we need a workaround as we did for WSL.

fflaten · 2023-07-30T16:05:00Z

Close this? See #20046 for root-cause fix to breakpoints issue. Parallels issue tracked in #20043

daxian-dbw · 2023-07-31T16:23:25Z

Superseded by #20046

andyleejordan added 2 commits July 28, 2023 13:54

Disable false assertion that blocks pwsh on Parallels VM

2ad1245

Revert "Fix slow execution when many breakpoints are used (#14953)"

df65f8f

This reverts commit d8decdc. This commit broke the VS Code extension's debugger, and should be reverted until such time that the root cause is found and a fix applied.

andyleejordan requested a review from daxian-dbw as a code owner July 28, 2023 21:03

pull-request-quantifier-deprecated bot added the Small label Jul 28, 2023

andyleejordan mentioned this pull request Jul 28, 2023

Allow means to avoid adding an absolute Cwd path to the workspace settings PowerShell/vscode-powershell#4557

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daxian-dbw reviewed Jul 28, 2023

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iSazonov reviewed Jul 29, 2023

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fflaten mentioned this pull request Jul 30, 2023

Use OrdinalIgnoreCase to lookup script breakpoints #20046

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daxian-dbw closed this Jul 31, 2023

andyleejordan mentioned this pull request Jul 31, 2023

Assertion in QueryDosDevice.cs failing in Parallels VM #20043

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andyleejordan deleted the andyleejordan/fix-debugger branch July 31, 2023 22:08

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Revert "Fix slow execution when many breakpoints are used (#14953)" #20042

Revert "Fix slow execution when many breakpoints are used (#14953)" #20042

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How to interpret the change counts in git diff output

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		// TODO: This actually hit in a Parallels VM, so it's not quite dead yet!
		// Diagnostics.Assert(false, "Really it is a dead code since GetDosDevice() is called only if PSDrive.DriveType == DriveType.Network");

Revert "Fix slow execution when many breakpoints are used (#14953)" #20042

Revert "Fix slow execution when many breakpoints are used (#14953)" #20042

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andyleejordan commented Jul 28, 2023

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