[fasmg] label jumping and skipping error

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bitRAKE

Joined: 21 Jul 2003
Posts: 3627
Location: vpcmipstrm

bitRAKE 06 Sep 2020, 23:55

If I put the "create" label on its own line the error goes away.

Code:

format PE64 CONSOLE 5.0
include 'win64wxp.inc'
.code

VV:
        use32
create: call 33h:?.64
        retn
?.64:   use64
        retf
Quilt:
invoke ExitProcess,eax
.end Quilt

Code:

flat assembler  version g.izxz
xerr.asm [7]:
        create: call 33h:?.64
? [11] ? [3] call [34]
Processed: dd @dest.offset
Error: symbol 'VV.64' is undefined or out of scope.

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06 Sep 2020, 23:55

bitRAKE

Joined: 21 Jul 2003
Posts: 3627
Location: vpcmipstrm

bitRAKE 07 Sep 2020, 02:22

What really threw me was that sometimes it doesn't produce and error:

Code:

        use32
mfree:  call 33h:?.64
        retn
?.64:   use64
        retf

...weird.

Edit: oh, it's because this followed the previous and it found the prior ?.64
That makes me think the second ":" causing the problem.

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07 Sep 2020, 02:22

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8135
Location: Kraków, Poland

Tomasz Grysztar 07 Sep 2020, 04:51

Starting with version ixvg several months ago I modified the definition of the base symbol for identifiers starting with dot, it is now the latest symbol defined before the current line, so the one defined in the same line does not count (it starts being applied with the next line). I did it to increase the consistency of the language - previously you could get different results depending on whether the line was processed by a macro or not.

07 Sep 2020, 04:51

bitRAKE

Joined: 21 Jul 2003
Posts: 3627
Location: vpcmipstrm

bitRAKE 07 Sep 2020, 06:33

That does mean I need to change my coding style. Thank you.

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07 Sep 2020, 06:33

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19258
Location: In your JS exploiting you and your system

revolution 07 Sep 2020, 07:20

That is a break from fasm syntax:

Code:

.y:
labl: jmp .y ; error: undefined symbol 'labl.y'.

07 Sep 2020, 07:20

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8135
Location: Kraków, Poland

Tomasz Grysztar 07 Sep 2020, 08:14

There is little reason to back-port this to fasm 1, even if I consider it a needed change in wider context.

07 Sep 2020, 08:14

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19258
Location: In your JS exploiting you and your system

revolution 07 Sep 2020, 08:17

Tomasz Grysztar wrote:

There is little reason to back-port this to fasm 1, even if I consider it a needed change in wider context.

I hope it isn't back ported to fasm. The current behaviour is good. I think the new fasmg behaviour breaks the principle of least surprise.

07 Sep 2020, 08:17

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8135
Location: Kraków, Poland

Tomasz Grysztar 07 Sep 2020, 08:42

revolution wrote:

I hope it isn't back ported to fasm. The current behaviour is good. I think the new fasmg behaviour breaks the principle of least surprise.

Yeah, sometimes it is just about choosing on which end the principle is going to be broken, because there is not enough blanket to cover everything. fasm[g]'s design has always been about finding a roughly acceptable solution in the face of irreconcilable self-contradictions. I was not happy about it, but I had to make a choice.

07 Sep 2020, 08:42

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