Support ',<number>' to visualize a pointer as an array #715

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1. gregg-miskelly commented on May 1, 2018

   

   Gregg Miskelly (gregg-miskelly)

   on May 1, 2018

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   CC Andrew Wang (@WardenGnaw)
2. gregg-miskelly commented on May 1, 2018

   

   Gregg Miskelly (gregg-miskelly)

   on May 1, 2018

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   Ling Wang (@digittigerw) I believe you would evaluate something like (int[20])myArr.

   Andrew Wang (@WardenGnaw) do I have that right?
3. digittigerw commented on May 1, 2018

   

   Ling Wang (digittigerw)

   on May 1, 2018

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   Yeah, actually (int[20])*myArr works. Thanks for the help ! Andrew Wang (@WardenGnaw) Gregg Miskelly (@gregg-miskelly)
4. Gregg Miskelly (gregg-miskelly)

   changed the title [-]how to watch a pointer as array [/-] [+]Support ',<number>' to visualize a pointer as an array[/+] on May 1, 2018
5. gregg-miskelly commented on May 1, 2018

   

   Gregg Miskelly (gregg-miskelly)

   on May 1, 2018

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   Ling Wang (@digittigerw) Excellent. I will leave this open to track the possible future feature of supporting ','.
6. digittigerw commented on May 2, 2018

   

   Ling Wang (digittigerw)

   on May 2, 2018

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   Gregg Miskelly (@gregg-miskelly) Cool. I'm really curious, can we add that support in MIEngine ? is interpretation (parsing) of the watch expression done by VS debugger engine or by debugger extension like MIEngine ?
   Issue #709 is my other more general question related to this.
7. gregg-miskelly commented on May 2, 2018

   

   Gregg Miskelly (gregg-miskelly)

   on May 2, 2018

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   The MIEngine has a tiny bit of support for format specifier today. I think the only thing we implemented was ,x and ,d. The array size format specifier could be implemented using this code: https://github.com/Microsoft/MIEngine/blob/72df3ee1ad81a9698a35ced2410016ea9910c5e0/src/MIDebugEngine/Natvis.Impl/Natvis.cs#L501
8. Trass3r commented on Jun 9, 2022

   

   Trass3r

   on Jun 9, 2022

   Last edited by Trass3r

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   MIEngine/src/MIDebugEngine/Engine.Impl/Variables.cs

   Lines 430 to 438 in 4f41195

   	// array with static size
   	// TODO: could return '(T(*)[n])(exp)' but requires T
   	var m = Regex.Match(trimmed, @"^\[?(\d+)\]?$");
   	if (m.Success)
   	return exp.Substring(0, lastComma);
   	// array with dynamic size
   	if (Regex.Match(trimmed, @"^\[([a-zA-Z_][a-zA-Z_\d]*)\]$").Success)
   	return exp.Substring(0, lastComma);

   We could actually use the *array@(len) syntax to make it work.
   Though that seems to be gdb only syntax.
9. WardenGnaw commented on Oct 10, 2022

   

   Andrew Wang (WardenGnaw)

   on Oct 10, 2022

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   Addressed with:
   #1329
   #1345
10. Andrew Wang (WardenGnaw)

    closed this as completedon Oct 10, 2022