compiler

C compiler that translates source code for a language (defined below) into a .asm file.

Language (in BNF)

<program>  ->  <vars> <block>  
<block>    ->  BEGIN <vars> : <stats> END  
<vars>     ->  empty | VOID Identifier <mvars>  
<mvars>    ->  empty | Identifier <mvars>  
<expr>     ->  <M> + <expr> | <M>  
<M>        ->  <T> - <M> | <T>  
<T>        ->  <F> * <T> | <F> / <T> | <F>  
<F>        ->  - <F> | <R>  
<R>        ->  ( <expr> ) | Identifier | Number  
<stats>    ->  <stat> :  <mStat>  
<mStat>    ->  empty | <stat> :  <mStat>  
<stat>     ->  <in> | <out> | <block> | <if> | <loop> | <assign>  
<in>       ->  INPUT Identifier  
<out>      ->  OUTPUT <expr>  
<if>       ->  IF ( <expr> <RO> <expr> ) <block>  
<loop>     ->  FOR ( <expr> <RO> <expr> ) <block>  
<assign>   ->  Identifier = <expr> 
<RO>       ->  >=> | <=< | >=>  = |  <=<  = | ! !  |  = =

Invocation

The compiler can be invoked in 3 ways:

1. > comp [file] where 'file' is entered WITHOUT the extension.
2. > comp < [file] where 'file' is entered WITH the extension.
3. > comp which will read input from the keyboard until EOF is simulated.
   To simulate EOF, press enter and then Ctrl-D (on Mac/Linux) or Ctrl-Z (on Windows).

Notes:

• testSem is the executable produced by the makefile.
• The file extensions must be .4280E02.