Interfaces in Assembly Language

Assembly language doesn’t have direct support for high-level concepts like interfaces, structs, or methods. However, we can simulate some of these concepts using lower-level constructs. Here’s an approximate translation:

; Interfaces are simulated using function pointers

section .data
    fmt_float db "%f", 10, 0  ; Format string for printing floats
    fmt_struct db "{%f, %f}", 10, 0  ; Format string for printing structs

section .text
    extern printf
    global main

; Struct definitions (simulated using contiguous memory)
struc rect
    .width: resq 1
    .height: resq 1
endstruc

struc circle
    .radius: resq 1
endstruc

; Function to calculate rectangle area
rect_area:
    push rbp
    mov rbp, rsp
    movsd xmm0, [rdi]      ; width
    mulsd xmm0, [rdi + 8]  ; height
    leave
    ret

; Function to calculate rectangle perimeter
rect_perim:
    push rbp
    mov rbp, rsp
    movsd xmm0, [rdi]      ; width
    addsd xmm0, [rdi + 8]  ; height
    addsd xmm0, xmm0       ; multiply by 2
    leave
    ret

; Function to calculate circle area
circle_area:
    push rbp
    mov rbp, rsp
    movsd xmm0, [rdi]      ; radius
    mulsd xmm0, xmm0       ; radius^2
    mulsd xmm0, [pi]       ; pi * radius^2
    leave
    ret

; Function to calculate circle perimeter
circle_perim:
    push rbp
    mov rbp, rsp
    movsd xmm0, [rdi]      ; radius
    mulsd xmm0, [two_pi]   ; 2 * pi * radius
    leave
    ret

; Measure function (simulates polymorphism)
measure:
    push rbp
    mov rbp, rsp
    sub rsp, 16

    ; Print the struct
    mov rdi, fmt_struct
    movsd xmm0, [rsi]
    movsd xmm1, [rsi + 8]
    mov rax, 2
    call printf

    ; Call area function
    mov rax, [rdx]
    call rax
    movsd [rsp], xmm0

    ; Print area
    mov rdi, fmt_float
    movsd xmm0, [rsp]
    mov rax, 1
    call printf

    ; Call perimeter function
    mov rax, [rdx + 8]
    call rax
    movsd [rsp + 8], xmm0

    ; Print perimeter
    mov rdi, fmt_float
    movsd xmm0, [rsp + 8]
    mov rax, 1
    call printf

    leave
    ret

main:
    push rbp
    mov rbp, rsp
    sub rsp, 48

    ; Create a rectangle
    mov qword [rsp], 3.0       ; width
    mov qword [rsp + 8], 4.0   ; height

    ; Create a circle
    mov qword [rsp + 16], 5.0  ; radius

    ; Create "vtables" (function pointer tables)
    mov qword [rsp + 24], rect_area
    mov qword [rsp + 32], rect_perim
    mov qword [rsp + 40], circle_area
    mov qword [rsp + 48], circle_perim

    ; Measure rectangle
    mov rdi, measure
    mov rsi, rsp
    lea rdx, [rsp + 24]
    call measure

    ; Measure circle
    mov rdi, measure
    lea rsi, [rsp + 16]
    lea rdx, [rsp + 40]
    call measure

    leave
    ret

section .data
    pi dq 3.14159265358979323846
    two_pi dq 6.28318530717958647692

This Assembly code approximates the concept of interfaces and method dispatch using function pointers. The measure function simulates polymorphism by accepting a pointer to a struct and a pointer to a function table (simulating a vtable).

To compile and run this program, you would typically use an assembler like NASM and a linker:

$ nasm -f elf64 interfaces.asm
$ gcc -no-pie interfaces.o -o interfaces
$ ./interfaces

This would produce output similar to the original Go program, showing the area and perimeter calculations for a rectangle and a circle.

Note that this is a very low-level implementation and lacks many of the safety and convenience features of high-level languages. In practice, assembly language is rarely used for this kind of abstraction, but this example demonstrates how high-level concepts can be implemented at a lower level.

Methods in Assembly Language

Enums in Assembly Language

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Interfaces in Assembly Language