PJDCc

A compiler of PJDC

(C Programming Language ' s Subset)

Framework

Install

After you clone this reposity, you just need to run my shell script : )

bash install.sh

Note:

PJDCC can compile code to x86 assembly. I borrow nasm to assembly, gcc's ld to link. So I will install nasm and gcc for you at first.

I have write some examples in "example" directory

You can try to use pjdcc compile them after install successfully

Uninstall

Just like install, I have write a shell script for you :

bash uninstall.sh

Usage

PJDCC's usage is very easy.

pjdcc [-ESTA] input_file

-E: Generate executable file (default)

-S: Compile to assembly file

-T: Scan the code, print tokens

-A: Parse the code, print abstract syntax tree

Note:

You don't need to input out_file's name.

If you pjdcc [-E] xxx.c, I will generate the executable file named xxx.

If you pjdcc -S xxx.c, I will generate the x86 assembly file named xxx.s.

Support

The whole ebnf grammar is in PJDC.ebnf

Data Type

• Basic Type: char(1byte), int(4byte), long(8byte), void(Function can return)
• Pointer Type: One dimension pointer of Basic Type, char*, int*, long*
• Array: One dimension array of Basic Type, char[], int[], long[]

Function

• Type: return Basic Type and Pointer Type
• Parameter: Basic Type and Pointer Type
• Support recursion function call

Scope

• Basic Type and Pointer Type support global variable and local variable
• Array only support global array
• Support initialize, global array can use initialized list

Statement

• Selection Statement: if and if-else, if else-if else-if...
• Iteration Statement: while, do-while, for
• Continue and Break
• Function Return

Expression (Operator)

• Comma Expression: xxx,xxx,xxx
• Assignment: identifier=xxx; *identifier=xxx; identifier[xxx]=xxx;
• Ternary: xxx ? xxx : xxx
• Logical Or And Not: || && !
• Bit Or Xor And Not: | ^ & ~
• Relational: == != < <= > >=
• Shift: << >>
• Arithmetic: + - * / %
• Increment Decrement: ++ --
• Sizeof: sizeof(Type) sizeof(identifier)

Comment

• Single-line: //xxx
• Multi-line: /* xxx */

Kiss declaration ( ^ 3 ^ )

Because I don't implement preprocessor and library, so I create this Keyword--kiss : )

If you use printf and scanf, I will help you link with standard library automaticly

But If you want to use other library's function, you need to "kiss" declare it

PS: How romantic it is !!! ( > _ < )

Example

kiss strlen;

int main()
{
    char* s="Baby,Kiss me!";

    printf("len=%d\n",strlen(s));

    return 0;
}

Limit

If you want to use pjdcc to compile your own code

I strongly recommend you to read the limit.md at first

Avoid you are confused by pjdcc's compile error ( > _ < )