'fix' directive is broken in 1.67.27?

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Index > Compiler Internals > 'fix' directive is broken in 1.67.27?

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IceStudent

Joined: 19 Dec 2003
Posts: 60
Location: Ukraine

IceStudent 27 Aug 2008, 16:21

Hi.

Subj. Following code works in 1.67.26, but doesn't work in 1.67.27:

Code:

format binary
x fix y
display 'hi'

27 Aug 2008, 16:21

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 27 Aug 2008, 17:30

It shows "hi" on FASMW 1.67.27, are you sure that exactly that code you posted is the one that doesn't works for you.

27 Aug 2008, 17:30

IceStudent

Joined: 19 Dec 2003
Posts: 60
Location: Ukraine

IceStudent 27 Aug 2008, 17:34

LocoDelAssembly wrote:

It shows "hi" on FASMW 1.67.27

But not on fasm.exe.

27 Aug 2008, 17:34

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 27 Aug 2008, 17:37

Hey you're right, pretty wierd Confused

Code:

C:\FASM>type fix-bug.asm
format binary
x fix y
display 'hi'

C:\FASM>fasm fix-bug.asm
flat assembler  version 1.67.27  (1072795 kilobytes memory)

C:\FASM>type fix-bug.asm
format binary
;x fix y
display 'hi'

C:\FASM>fasm fix-bug.asm
flat assembler  version 1.67.27  (1071963 kilobytes memory)
hi
1 passes, 0 bytes.

C:\FASM>

27 Aug 2008, 17:37

IceStudent

Joined: 19 Dec 2003
Posts: 60
Location: Ukraine

IceStudent 27 Aug 2008, 18:24

No, broken is display or, rather, add_preprocessor_symbol subroutine, because it calls get_directive without clearing a high bytes of the ECX register, so lower_case routine will clear a con_handle variable and subsequent calls to the display_block will fail.

One way to fix is here:

Code:

*** PREPROCE.INC        2008-07-09 18:38:20.000000000 +0300
--- preproce.inc 2008-08-27 21:09:34.265625000 +0300
***************
*** 487,492 ****
--- 487,493 ----
      push    edi
         mov     edx,esi
     mov     ebp,ecx
+    and     ecx,0xFF
    call    lower_case
          pop     edi
        scan_directives:

27 Aug 2008, 18:24

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20335
Location: In your JS exploiting you and your system

revolution 27 Aug 2008, 20:01

Very nice, both a bug report and it's fix. Well done.

27 Aug 2008, 20:01

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