Crash on ridiculous array sizes?

[minxomat]

AutoIt usually catches array sizes that make no sense:

ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[9e9]

(2) : ==> Variable subscript badly formatted.:
Dim $_[9e9]
Dim $_[^ ERROR
->12:23:54 AutoIt3.exe ended.rc:1
+>12:23:54 AutoIt3Wrapper Finished.

But, 

ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[1e9]

--> Press Ctrl+Alt+Break to Restart or Ctrl+Break to Stop
> 3.3.14.2
!>12:25:16 AutoIt3.exe ended.rc:-1073741819
+>12:25:16 AutoIt3Wrapper Finished.
>Exit code: 3221225477    Time: 7.2

 

Only occurs in 3.3.14.2 for me.

[Melba23]

minxomat,

With v3.3.14.2 I get an error flagged both with and without Au3Check:

ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[9e9]

>Running:(3.3.14.2):M:\Program\AutoIt3\autoit3.exe "M:\Program\Au3 Scripts\fred4.au3"    
--> Press Ctrl+Alt+Break to Restart or Ctrl+Break to Stop
> 3.3.14.2
"M:\Program\Au3 Scripts\fred4.au3" (3) : ==> Variable subscript badly formatted.:
Dim $_[9e9]
Dim $_[^ ERROR
->11:33:05 AutoIt3.exe ended.rc:1
+>11:33:05 AutoIt3Wrapper Finished.

#AutoIt3Wrapper_Run_AU3Check=n
ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[9e9]

>Running:(3.3.14.2):M:\Program\AutoIt3\autoit3.exe "M:\Program\Au3 Scripts\fred4.au3"    
--> Press Ctrl+Alt+Break to Restart or Ctrl+Break to Stop
> 3.3.14.2
"M:\Program\Au3 Scripts\fred4.au3" (4) : ==> Variable subscript badly formatted.:
Dim $_[9e9]
Dim $_[^ ERROR
->11:31:43 AutoIt3.exe ended.rc:1
+>11:31:43 AutoIt3Wrapper Finished.

M23

[minxomat]

Yes, same for me, because you tried the working snippet twice, now try the other.

[Melba23]

minxomat,

I see it now - sorry about that.

M23

[minxomat]

I see it now

Does it crash for you?

[Melba23]

minxomat,

Yes, I get the same result as you - using [9e9] errors, using [1e9] crashes - but I have no idea why as I would have expected both to result in errors. You say it only happens in 3.3.14.2, have you checked in 3.3.14.0/1?

M23

[minxomat]

have you checked in 3.3.14.0/1?

No. 

I know that it is impossible to check array bounds at runtime if they depend on other lines of code (Halting Problem), but I think this constant expression should produce an error in any case where it evaluates to >16777216. Or is this intended behavior?

[UEZ]

Is 1e9 something like 1*10^9?

[minxomat]

Is 1e9 something like 1*10^9?

Yes, scientific notation for programming languages.

[water]

I think it is a problem with AutoIt not interpreting 1e9 as a number.
When I try the following code with 3.3.15.0 I get "Map" as the variable type.

ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[9e9]
ConsoleWrite(VarGetType($_) & @CRLF)

 

[UEZ]

Your example could be simplified to

Global $a[1000000000]

which crashes also.

[minxomat]

I think it is a problem with AutoIt not interpreting 1e9 as a number.
When I try the following code with 3.3.15.0 I get "Map" as the variable type.

ConsoleWrite("> " & @AutoItVersion & @LF)
Dim $_[9e9]
ConsoleWrite(VarGetType($_) & @CRLF)

 

It runs? I guess(!) this is because it is out of any array bounds valid for AutoIt. Maybe Maps can have more elements.

[minxomat]

Your example could be simplified to

Global $a[1000000000]

which crashes also.

This is exactly the same. You could also write 10000000*10, it'll be the same number - that's not the problem. 

[TheDcoder]

From here:

VAR_SUBSCRIPT_ELEMENTS = 16,777,216 (This is the limit of elements in an Array)

9e9 (9000000000) is wayyyyy more than 16,777,216

[minxomat]

@TheDcoder Did you even read my posts?

I know that it is impossible to check array bounds at runtime if they depend on other lines of code (Halting Problem), but I think this constant expression should produce an error in any case where it evaluates to >16777216. Or is this intended behavior?

Edited November 6, 2015 by minxomat

[water]

From here:

9e9 (9000000000) is wayyyyy more than 16,777,216

But you should then get error message "Array maximum size exceeded." and not "Variable subscript badly formatted."

[minxomat]

"Array maximum size exceeded."

I'm not able to produce this error. Can you post an example?

---

Meanwhile other test cases:

ConsoleWrite("> " & @AutoItVersion & @LF)

Global Const $iArrayMax = 16777216
Global Const $iOverflow = 16777777

Local  $1[$iOverflow] ; crash
Global $1[$iOverflow] ; crash
Dim    $1[$iOverflow] ; crash

Local $2[$iArrayMax]
ReDim $2[$iArrayMax + 1] ; crash

Local $3[3.141] ; works fine
ConsoleWrite("!> Bound: " & UBound($3) & @LF)

 

Edited November 6, 2015 by minxomat

[TheDcoder]

@minxomat Oh, sorry, miss it ...

@water Strange it, it crashes for me when it exceeds 16,777,216 (No errors, nothing, just crash message)

[water]

Sure. I get "Array maximum size exceeded." with AutoIt 3.3.12.0

ConsoleWrite("> " & @AutoItVersion & @LF)
Global $iElements = 9000000000
Global $aArray[$iElements]

 

[minxomat]

Strange it, it crashes for me when it exceeds 16,777,216 (No errors, nothing, just crash message)

Congratulations, you found out what this thread is about!