165 lines
2.2 KiB
Plaintext
165 lines
2.2 KiB
Plaintext
; Some rather complex macros to add strucures (sort of) to your assembly
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; language programs. (Needs SNASM >=0.21)
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; This is presented as a starting point for discussion rather than a working
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; and useable piece of code
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; It may take you a while to figure out how these macros work but it is worth
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; the effort!
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; Run through the field array of Type and define all the offsets from Name
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Define macro Name,Type
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local TagNum,Temp
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TagNum = 0
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\Name equ *
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rept \Type\_Count
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Temp equs \Type\_\#TagNum
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\Name\_\Temp equ \Name+\Type\_\Temp
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TagNum = TagNum+1
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endr
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ds.b \Type\_Size
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endm
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; Initialise a field array
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Record macro Name
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_RecName equs '\Name'
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_RecCount = 0
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rsreset
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endm
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; Add a name to the current field array
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NewName macro Name
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\_RecName\_\#_RecCount equs '\Name'
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_RecCount = _RecCount+1
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endm
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; Terminate field array
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Recend macro
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\_RecName\_Size equ __RS
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\_RecName\_Count equ _RecCount
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endm
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; Add either a simple type or a structure to the current field array
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RI macro Name,Field
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local TagNum,Temp,Base
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; Check for simple types
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if strcmp('\Field','byte')
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\_RecName\_\Name rs.b 1
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NewName \Name
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elseif strcmp('\Field','word')
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\_RecName\_\Name rs.b 2
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NewName \Name
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elseif strcmp('\Field','long')
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\_RecName\_\Name rs.b 4
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NewName \Name
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else
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; It's a structure so run through field array adding new names
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\_RecName\_\Name equ __RS
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NewName \Name
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TagNum = 0
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Base = __RS
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rept \Field\_Count
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Temp equs \Field\_\#TagNum
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\_RecName\_\Name\_\Temp equ Base+\Field\_\Temp
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NewName \Name\_\Temp
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TagNum = TagNum+1
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endr
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rs.b \Field\_Size
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endif
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endm
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; Now define some structures
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Record Point
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RI X,word
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RI Y,word
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Recend
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Record Rectangle
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RI P1,Point
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RI P2,Point
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Ri Colour,word
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Recend
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; now use them
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org $1000
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Define Fred,Rectangle
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list
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; so I can now do
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move.w #4,Fred_P1_X
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lea Fred_P1(pc),a0
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add.w #4,Point_X(a0)
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; and
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lea Fred,a0
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move.w #12,Rectangle_P1_X(a0)
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lea Rectangle_P1(a0),a1 ;a1 points at point 1 in fred
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move.w Point_X(a1),d0
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end
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; I would of course prefer something like :-
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move.w #4,Fred->P1->X
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lea Fred->P1(pc),a0
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add.w #4,Point->X(a0)
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; any ideas on a nice syntax for these structures or does everyone hate them?
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