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zakirullin / tiny-compiler

A tiny compiler for a language featuring LL(2) with Lexer, Parser, ASM-like codegen and VM. Complex enough to give you a flavour of how the "real" thing works whilst not being a mere toy example.

MIT License

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zakirullin Merge pull request #8 from Costava/malloc0

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Oct 1, 2020

Merge pull request #8 from Costava/malloc0

Fix safe_malloc infinite recursion and use safe_malloc

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README.md

A tiny compiler for a simple synthetic language featuring LL(2) grammar, written in pure C

The compiler consist of typical parts, known as:

The compiler is implemented for educational purposes. Some parts are simplified for the sake of better understanding

Build

$ make

Usage

$ ./compiler <source>

An example program for Pythagorean theorem:

cath1 = 3;
cath2 = 4;
hypsquare = cath1 * cath1 + cath2 * cath2;

Execution result:

hypsquare = 25

Generated ASM:

PUSH 3
WRITE cath1
PUSH 4
WRITE cath2
READ cath1
READ cath1
MUL POP, POP
READ cath2
READ cath2
MUL POP, POP
ADD POP, POP
WRITE hypsquare

The language description in EBNF:

program = expr, ";", { program } ;
expr = id, "=", expr | term, { ("+"|"-"), term } ;
term = factor, { ("*"|"/"), factor } ;
factor = "id" | "num" | "(", expr, ")" ;

About

A tiny compiler for a language featuring LL(2) with Lexer, Parser, ASM-like codegen and VM. Complex enough to give you a flavour of how the "real" thing works whilst not being a mere toy example.

compiler parser lexer ast asm

Readme

MIT License