Re: Dragonflame 0.3a is out!
Hi robjoy,
This is directly concerning DFE because I would like to discuss the compiler and how its going to work. there are a few things you must know in order to write a compiler.
[list=#]
[#]You must know assembly language. For instance, you must know what a very simple program is in assembly language. This is a very simple file that does nothing, but contains the code
int main()
{
}
in assembly language. If you want to write a compiler, you must know what the following assembly source does
.file "asmtst.c"
.def ___main; .scl 2; .type 32; .endef
.text
.globl _main
.def _main; .scl 2; .type 32; .endef
_main:
leal 4(%esp), %ecx
andl&nb
sp; $-16, %esp
pushl -4(%ecx)
pushl %ebp
movl %esp, %ebp
pushl %ecx
subl $4, %esp
call ___main
addl $4, %esp
popl %ecx
popl %ebp
leal -4(%ecx), %esp
ret
Now this might seem easy, just paste it in! But there are a few things you must also know in order to do anything useful. Here is a simple hello world program in C, then assembly language:
C:
#include <stdio.h>
int main(int argc, const char* argv[])
{
printf ("Hello world!\n");
}
Assembly language:
.file "asmtst.c"
.def ___main; .scl 2;&n
bsp; .type 32; .endef
.section .rdata,"dr"
LC0:
.ascii "Hello world!\0"
.text
.globl _main
.def _main; .scl 2; .type 32; .endef
_main:
leal 4(%esp), %ecx
andl $-16, %esp
pushl -4(%ecx)
pushl %ebp
movl %esp, %ebp
pushl %ecx
subl $4, %esp
call ___main
movl $LC0, (%esp)
call _printf
addl $4, %esp
popl %ecx
popl %ebp
leal -4(%ecx
), %esp
ret
.def _printf; .scl 2; .type 32; .endef
This does the exact thing in C as the assembler source does. Both do the same thing.
[#]You cannot convert source code to assembly language in lua. That requires another compiler like Gcc.[/#]
[#]You must know another high level language like C, C++, fortran, go, objective C, objective C++ or ada. This is a definite requirement.[/#]
[#]you must know the registers of the computers CpU architecture. For instance, a 32 bit CPU has eax, ax, etc, while a 64 bit system has rax, rbx etc.[/#]
[#]You need to know machine language, or a way to convert the binary created by your compiler into executable, machine language code that can be executed directly without going through an interpreter. Maybe GNU bison would be another, better choice?[/#]
[/list]
You should study these things before even t
hinking about writing a compiler.
URL: http://forum.audiogames.net/viewtopic.php?pid=160369#p160369
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