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flat assembler > Windows > reserve directive

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darlok



Joined: 04 Aug 2003
Posts: 4
Location: Tomsk, Russia
I think it isnt great that when I code this: somevar rb 1000, size of my program increases by 1000. Other assemblers didnt do that. Of course, I may reserve memory dynamically, but sometimes it isnt comfortable Sad

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Post 04 Aug 2003, 09:13
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JohnFound



Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria
It's not because of FASM it's because of PE format. Other assemblers simply hides this from you. The right approach is to put all your uninitialized data as last data in the section, to allow FASM to shrink the size of the section to only initialized data. Another right approach is to make one section for initialized data and one for uninitialized.

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Post 04 Aug 2003, 09:26
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scientica
Retired moderator


Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden
Code:
format PE
entry start
section '.bss' data readable writeable
 BigOne rb 1024
 EvenBigger rd 1024*1024
section '.text' code readable executable
start:
 ret    

This will generate a 1024 byte large exe. I always try to put all my uninitialised in a section called .bss (it seems to be the common name for it, as for the code, sometimes i use '.code' others '.text' - is there some document on the naming of the sections, does it matter what name they have?)

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Post 04 Aug 2003, 12:06
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