Assembler-software-project

🚀 A C-based compiler for our fantasy code, By Yael Gluskin and Eti Gotliv bestowed.

Assignments Overview

Imaginary Programming Language Compiler

The assembler builds a file containing machine code, from a given file of a program written in assembly language that will be defined here.

Table of Contents

• Features

• Usage

  • Types of Sentences

• Example

Features

• Converts assembly language code into machine code.

Usage

Types of Sentences

1. Instruction Sentence

An instruction sentence contains assembly language instructions that will be translated into machine code.

There are 15 instruction words:

word	code	number of operands
0	mov	2
1	cmp	2
2	add	2
3	sub	2
4	not	2
5	clr	2
6	lea	2
7	inc	1
8	dec	1
9	jmp	1
10	bne	1
11	red	1
12	prn	1
13	jsr	1
14	rts	0
15	stop	0

2. Directive Sentence

A directive sentence provides directives to the assembler, guiding it in processing the code or defining data.

The directive sentence has the following structure:

directive	explanation	example
.data	A directive to allocate space for parameters	.data 7, −57, +17, 9
.string	A directive to group space into a string	STR: .string "abcde"
.entry	Characterizes the labels as one that is stored in this file.	.entry SHALOM
.extern	Characterizes the labels as one that is not defined in this file.	.extern BYE

At the beginning of the sentence a definition of a label can appear and then the word of instruction:

3. Comment Sentence

A comment sentence is used to add comments and explanations to the code. It is ignored by the assembler.

; This code prints 'Hello, World!' to the console

4. Empty Sentence

An empty sentence has no instructions or data and is typically used for formatting purposes. This is a line that contains only whitespace characters, i.e. contains only the characters '\t' and ' ' (tabs and spaces). It is possible that there is no character in the line (except the character '\n' meaning the line is empty).

Example

An example of assembly language code becomes machine language

; Provide a simple example of assembly code
	MAIN:	add r3, LIST
 	LOOP:	prn #48
		lea STR, r6
		inc r6
		mov *r6 , 	K
		sub r1, r4
		cmp r3, #-6
		bne END
		dec K 
		jmp LOOP 
	END:	stop 
	STR:	.string "abcd"  	 	 
	LIST:	.data 6,-9
		.data -100
	K:	.data 31