C-compiler

A bare-bones C compiler built in Javascript (~1000 lines)
Compiles into GNU assembly and ran independently on a virtual machine
Note that NodeJS v16 is needed along with xxoriso, GNU binutils, and QEMU

compile and run with ./compile.bash example.c Output assembly will in a file called code.s

Special Features:

This compiler is slightly different than all others, please read this

• Returns statements must have brackets like a function call
  • Unless it is a void function
• All mathematics equations must be placed in eq(...) and are evaluated left-to-right in an accumulative manner
  • Do not use parenthesis in these equations
  • For multiplication use x
  • For & use AND
• Functions can be called a pointer (ex. int *) and do not need to be casted to a special type
  • An unlimited number of parameters is also supported
  • Do not worry about editor warnings
• Pointers can be operated on without casts
• The address of an array can be maniuplated like a pointer
• There is no strict type checking
• There are 3 types:
  • char: 1 byte
  • short: 2 bytes
  • int: 4 bytes

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See notes.txt for things that are not currently working

More Notes:

• All assembly runs standalone
• This means I have built my own tty driver, keyboard handler etc.
• This also means that many functions may not work properly
• However, you can always make your own drivers
• Feel free to look into BODY/libs or here
  • A sample tty driver written in C (for my compiler) I have been working on can be found in CCompiler/old tests/vga.c

Changelog - 2022

April 24

• First stage of the compiler is up and running
• Definition of variables, pointers, buffers, etc.

April 27

• Functions with return types and parameters
• stdout is fully functional

April 29

• Pointers fixed
• Pointer type arrays
• Math can now be expressed with eq(...)

April 30

• Labels and goto statements

May 5

• While statements included
• Strings no longer need to be passed with &

May 8

• Pointer typed parameters
• String literals
• If and If else statements
• Unlimited amount of indirect memory references per line

May 12

• Casting
• Calling functions from pointers

May 14

• Pointer casting
• String literals with spaces in them
• sizeof
• static allocation alloc(type, size)

July 6

• Fixed pointer casting
• Fixed crash on divide/remainder
• Allows indirect values on variable init

July 7

• & now supported in eq() as AND
• Early returns
• Indirect array modification
• New precompiler/preprocessor
• #define replacement macros
• Comments with //

July 9

• Reworked normal replacement macros
• Macros with parameters
• While loops with pointers

July 13

• Fixed un-initialized arrays
• Added stdin: char getc(void) void gets(pointer) and void geti(pointer)

July 17

• Replaced old stdio library with new one (finally)
• Added importing system files
• char_ln string_ln int_ln print a new line afterwards
• <stdio.s> and <strings.s>
• Fixed pointer arrays
• Re-asigning a pointer with a string