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Index > Compiler Internals > How to assemble jumps and procedures

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viraj2005



Joined: 16 Jan 2008
Posts: 2
Location: Sri Lanka
viraj2005
Hi All,

This is my first time in the FASM forum.

Recently I have started to build an OO compiler. I want to build my own assembler for it, I know the basics of assembler development. But I dont know how to assemble jumps and procedures.

Can any one advise me how to implement jumps and procedures.

thanks

Viraj

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Viraj Siriwardana
Post 16 Jan 2008, 05:20
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
my advice would be to use FASM as backend compiler, if you don't know how to do this.
Post 16 Jan 2008, 05:25
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viraj2005



Joined: 16 Jan 2008
Posts: 2
Location: Sri Lanka
viraj2005
Hi Vid,

thanks for the reply.
I really wants to build my own assembler cos it is my final year project.

Rgds,

Viraj
Post 16 Jan 2008, 05:31
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DOS386



Joined: 08 Dec 2006
Posts: 1901
DOS386
.

> Recently I have started to build an OO compiler. I want to build my own assembler

> really wants to build my own assembler cos it is my final year project.

Isn't the OO compiler itself hard enough ? Confused

> But I dont know how to assemble jumps and procedures.

1. CPU has no procedures. "proc" in MASM is just a sub, with some odd extra stuff processed/added by the assembler (stack frame, "local" stuff, parameter counting/checking ?).

2. Jumps: you need at least 2 passes.
- 1st pass place all labels into a table, compile back jumps but leave forward jumps open (assume "near")
- 2nd pass fill the forward jumps from table
This works but is suboptimal ... FASM does more than 2 passes and is better.

And YES, you should focus on your "OO" and just use FASM.

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Bug Nr.: 12345

Title: Hello World program compiles to 100 KB !!!

Status: Closed: NOT a Bug
Post 16 Jan 2008, 10:52
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System86



Joined: 15 Aug 2007
Posts: 77
System86
Quote:

But I dont know how to assemble jumps and procedures.


When compiling to asm for the fasm backend, use jmp for jumps and call for procedures (as for these, you can create a stack frame using the enter/leave instructions or by modifying esp, the CPU won't do if for you).
Post 16 Jan 2008, 23:38
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