yac

Yet Another Compiler
A compiler from C Subset to Javascript

How to compile the code

1. Compile 'mycom.grm' file using 'mlyacc mycom.grm'
2. Compile 'mycom.lex' file using 'mllex mycom.lex'
3. Run myC.mlb using 'mlton myC.mlb'
4. Run the output executable file. (./myC test1.c) The output would be in out.js file

Subset of C language

• Control statements (if, else, break, continue)
• Loop (while)
• Variables
• Arithmetic operators(+, -, *, /, %)
• Logical operators(&&, ||)
• Assignment operator(=)
• Relational Operators(<, >, <=, >=, ==)
• Function defenitions
• Types(Int, Float, Char)

File Descriptions

ast.sml

Contains the datatypes to encode the abstract syntax tree.

myC.mlb

ML Basis file that contain all the source files of the project.

mycom.grm

Describes the grammar of the language.

mycom.lex

Rules for token matching.

parsetest.sml

Driver program. Join lex and yacc files. Initiates parsing.

translate.sml

Converts the ast to javascript code.

Notes

• print and return can support only with single variable.
• usage of print : print(variable);