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Ange Albertini
100 lines
1.9 KiB
NASM
100 lines
1.9 KiB
NASM
; a mini Java CLASS in assembly, doing nothing
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; Ange Albertini, BSD Licence 2012-2017
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;*******************************************************************************
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; macros
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%macro RETURN 0
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db 0b1h
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%endmacro
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%macro _dd 1
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db (%1 >> 8 * 3) & 0ffh
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db (%1 >> 8 * 2) & 0ffh
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db (%1 >> 8 * 1) & 0ffh
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db (%1 >> 8 * 0) & 0ffh
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%endmacro
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%macro _dw 1
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db (%1 >> 8 * 1) & 0ffh
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db (%1 >> 8 * 0) & 0ffh
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%endmacro
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%macro lbuffer 1
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_dw %%end - 1 -$
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db %1
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%%end:
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%endmacro
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%macro utf8 1
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db 1
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lbuffer %1
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%endmacro
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%macro string 1
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db 8
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_dw %1
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%endmacro
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%macro classref 1
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db 7
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_dw %1
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%endmacro
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ACC_PUBLIC equ 1
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ACC_STATIC equ 8
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;*******************************************************************************
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; header
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_dd 0CAFEBABEh ; signature
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_dw 3 ; major version
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_dw 2dh ; minor version
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;*******************************************************************************
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; constant pool
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_dw 08 ;constant pool count
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;<always empty> ; 00
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classref 2 ; 01
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utf8 'mini' ; 02
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classref 4 ; 03
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utf8 'java/lang/Object' ; 04
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utf8 'main' ; 05
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utf8 'Code' ; 06
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utf8 '([Ljava/lang/String;)V' ; 07
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_dw ACC_PUBLIC ;access_flag
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_dw 1 ;this class
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_dw 3 ;super class
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_dw 0 ; interfaces_count
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; no interfaces
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_dw 0 ; fields_count
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; no fields
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_dw 1 ; methods_count
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_dw ACC_PUBLIC + ACC_STATIC
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_dw 5 ; methodname: 'main'
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_dw 7 ; return type: ([Ljava/lang/String;)V
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_dw 1 ; attribute_count
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_dw 6 ; attributename: Code
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_dd 13 ; length
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_dw 0 ; maxlocals
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_dw 1 ; maxstack
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_dd 1 ; length of bytecode
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RETURN
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_dw 0 ; exceptions_count
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_dw 0 ; attributes_count
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_dw 0 ;attributes_count
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; no attributes
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