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Index > Compiler Internals > TABLES.INC - instruction table
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shutdownall



Joined: 02 Apr 2010
Posts: 517
Location: Munich
shutdownall 21 Jan 2013, 23:25
I have to extend the tables.inc structure, the part instructions for a special project with different but mostly similar targets and other coding of instructions. I don't want to do separate versions because they are really similar but not 100% identical.

So I wonder about this calculation:

Code:
instructions:
 dw instructions_2-instructions,(instructions_3-instructions_2)/(2+3)
 dw instructions_3-instructions,(instructions_4-instructions_3)/(3+3)
 dw instructions_4-instructions,(instructions_5-instructions_4)/(4+3)
 dw instructions_5-instructions,(instructions_6-instructions_5)/(5+3)
 dw instructions_6-instructions,(instructions_7-instructions_6)/(6+3)
 dw instructions_7-instructions,(instructions_8-instructions_7)/(7+3)
 dw instructions_8-instructions,(instructions_9-instructions_8)/(8+3)
 dw instructions_9-instructions,(instructions_10-instructions_9)/(9+3)
 dw instructions_10-instructions,(instructions_11-instructions_10)/(10+3)
 dw instructions_11-instructions,(instructions_12-instructions_11)/(11+3)
 dw instructions_12-instructions,(instructions_13-instructions_12)/(12+3)
 dw instructions_13-instructions,(instructions_14-instructions_13)/(13+3)
 dw instructions_14-instructions,(instructions_15-instructions_14)/(14+3)
 dw instructions_15-instructions,(instructions_16-instructions_15)/(15+3)
 dw instructions_16-instructions,(instructions_end-instructions_16)/(16+3)

First word is the offset of the instruction table "part".
Second word is the size of every instruction "part" but what is that division for ?

Looks a bit crazy, try to understand the purpose. Maybe someone can answer (other than look in source Rolling Eyes ).

Thanks !
Post 21 Jan 2013, 23:25
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Spool



Joined: 08 Jan 2013
Posts: 151
Spool 22 Jan 2013, 04:00
[ Post removed by author. ]


Last edited by Spool on 17 Mar 2013, 04:28; edited 1 time in total
Post 22 Jan 2013, 04:00
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20630
Location: In your JS exploiting you and your system
revolution 22 Jan 2013, 05:04
shutdownall wrote:
Second word is the size of every instruction "part" but what is that division for ?
It computes the total number of instructions of each length.
Post 22 Jan 2013, 05:04
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shutdownall



Joined: 02 Apr 2010
Posts: 517
Location: Munich
shutdownall 22 Jan 2013, 17:04
Thanks, now it's got clear. First I thought about different length of instruction names but it is per section. +3 ist for the identification "byte" plus offset of the function to process the instruction.

Maybe yesterday was to late when I took a view in the source. Razz
Post 22 Jan 2013, 17:04
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