flowrian

My own designed language and compiler.
This compiler(nameed flower) works to change flowrian code to assembler of tvm.

[!] this is not a perfect language or perfect compiler.
(i just made this as a term project of compiler lecture.)

#add::integer, integer -> integer (
  start $a, $b; 
  $c::integer = $a + $b; 
  end $c; 
)

#main :: void -> integer (
  start ;
  $greeting::char[20] = "helloFlowrian"; 
  @ <- $greeting; 
  $sum :: integer; 
  $sum = #add 3, 4; 
  @ <- $sum;  
  end 1; 
)

How To Use?

Download and Build

#download bison and flex first 
sudo apt-get install flex bison 

git clone https://github.com/zetwhite/flowrian.git
cd flowrian 
make

git clone https://github.com/woogyun/tvm.git 
cd tvm 
cp make.bat make
make

write your flowrian code

you can get more example code from exampleCode.

--fibo.fw
#getFibo::integer->integer(
  start $number; 

  $result::integer; 
  if($number <= 1){
    $result = $number; 
  }
  else{
    $result = (#getFibo ($number - 1)) + (#getFibo ($number - 2)); 
  }

  end $result; 
)


#main::void->void(
  start; 
  
  $number::integer = 6; 
  @ <- "FiboOf6Is"; 
  @ <- #getFibo $number; 

  end; 
)

compile and run

./flower -t -f -o fibo.t < fibo.fw
# this options show symbol table and function list you defined
# you can get fibo.t as output 

# goto tvm and run fibo.t code 
./tvm fibo.t

How Does It Work?

This is a simple example of working process. start with, #add function.

#add::integer, integer -> integer (
	 	start $a, $b;
		$c::integer;
		$c = $a + $b; 
		end $c;
)

parse and get AST

for specific, you can check Block and Node class in ast folder. there are a number of child classes of Block and Node class to represent various syntax of flowrian.

create Symbol tables

there is a Symbol table per function.
for more info, you can check symtab folder(Symtab class, SymNode class) and AddSymbol function of Block class.

type checking

There are some points to be checked before generating code.
If there is an assignment statment, you have to check left side and right side are same type(or type casting is possible) and also, whether left side is a variable that value can be changed or not.
for more info, check checkType function of Block class and calcType function of Node class.

generate code

there are some routine for each statement to create a valid tvm assembly code.
check codeGen function of Block class and calcNode function of Node class.

zetwhite / flowrian