Re: LLVM discussion
@visualstudio, I do not recommend you make a compiler at all. For now, just have an interpreter. A compiler isn't actually needed yet. Wait until your very good with assembly language, machine language (I know, but its required to assemble a game into direct machine code without use of an already available assembler), or, if you are able to use assembly, find a good assembler (I recommend NASM), and then use that instead. Simply have your interpreter translate the game into assembly language and have NASM assemble it. Below, I have an example hello world program in NASM:
This is a Hello world program for the DOS operating system.
section .text
org 0x100; semicolons are comments and ignored. 0x100 is 256 in our decimal system.
mov ah, 0x9
mov dx, hello
int 0x21
mov ax, 0x4c00
int 0x21
section .data
hello: db 'Hello, world!', 13, 10, '$'
An example of a similar program for Microsoft Windows:
global _main
extern _MessageBoxA@16
extern _ExitProcess@4
section code use32 class=code
_main:
push dword 0 ; UINT uType = MB_OK
push dword title ; LPCSTR lpCaption
push dword banner ; LPCSTR lpText
push dword 0 ; HWND hWnd = NULL
call _MessageBoxA@16
push dword 0 ; UINT uExitCode
call _ExitProcess@4
section data use32 class=data
banner: db 'Hello, world!', 0
title: db 'Hello', 0
An equivalent program for Linux:
global _start
sectio
n .text
_start:
mov eax, 4 ; write
mov ebx, 1 ; stdout
mov ecx, msg
mov edx, msg.len
int 0x80 ; write(stdout, msg, strlen(msg));
mov eax, 1 ; exit
mov ebx, 0
int 0x80 ; exit(0)
section .data
msg: db "Hello, world!", 10
.len: equ $ - msg
For X64 processors:
section .text
org 0x100
mov ah, 0x9
mov dx, hello
int 0x21
mov ax, 0x4c00
int 0x21
section .data
hello: db 'Hello, world!', 13, 10, '$'
An example of a
similar program for Microsoft Windows:
global _main
extern _MessageBoxA@16
extern _ExitProcess@4
section code use32 class=code
_main:
push dword 0 ; UINT uType = MB_OK
push dword title ; LPCSTR lpCaption
push dword banner ; LPCSTR lpText
push dword 0 ; HWND hWnd = NULL
call _MessageBoxA@16
push dword 0 ; UINT uExitCode
call _ExitProcess@4
section data use32 class=data
banner: db 'Hello, world!', 0
title: db 'Hello', 0
An equivalent program for Linux:
global _start
section .text
_start:
mov rax, 4 ; write
mov&nbs
p; rbx, 1 ; stdout
mov rcx, msg
mov rdx, msg.len
int 0x80 ; write(stdout, msg, strlen(msg));
mov rax, 1 ; exit
mov rbx, 0
int 0x80 ; exit(0)
section .data
msg: db "Hello, world!", 10
.len: equ $ - msg
I know, it looks complicated, but its actually quite easy. Of course, after the assembly is done, have the program link it with ld or some other linker. Do not try and design your own linker!
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