Search code examples
classassemblymacrosmasm

struct or class in assembly

I need something like struct or class in c++

For example I need a class with an array and two attribute (size and len) and some function like append and remove .

How can I implement this in assembly with macros and procedures?

Solution

  • Tasm supports eg.

    struc String  // note: without 't' at the end
   size   dw 100
   len    dw 10
   data   db 0 dup(100)
ends String

    Gnu assembler also has a .struct directive.

    The syntax for MASM is: 

    String STRUCT
    size dw 100
    len dw 10
String ENDS

    Usage again from the same MASM manual:

    ASSUME eax:PTR String
mov ecx, [eax].size,
mov edx, [eax].len
ASSUME eax:nothing
.. or ..
 mov ecx, (String PTR [eax]).size   // One can 'cast' to struct pointer

    One can also access a local variable directly 

    mov eax, myStruct.len